linters+testdata: Reformat all yaml testcases for linting. (#6511)

This commit adds a config for yamllint, mass-reformats all of
the existing Yaml testcases to pass linting, and adds a Yaml
linting job to the pull-request Github Actions workflow. A few 
careful exceptions and ignores were added to the linter's
config to allow keeping our existing Yaml files with minimal
reformatting.

Signed-off-by: Philip Conrad <philipaconrad@gmail.com>

test/cases/testdata/functionerrors/test-conflicts.yaml

@@ -1,21 +1,22 @@
+---
 cases:
-- modules:
-  - |
-    package test
-    o = ["1", "2"]
-    f(x) := o[_] == x
-    p { f("1") }
-  note: 'functionerrors/conflict: plain false and true result, first round'
-  query: data.test.p = x
-  want_error: functions must not produce multiple outputs for same inputs
-  want_error_code: eval_conflict_error
-- modules:
-  - |
-    package test
-    o = ["1", "2"]
-    f(x) := o[_] == x
-    p { f("2") }
-  note: 'functionerrors/conflict: plain false and true result, second round'
-  query: data.test.p = x
-  want_error: functions must not produce multiple outputs for same inputs
-  want_error_code: eval_conflict_error
+  - modules:
+      - |
+        package test
+        o = ["1", "2"]
+        f(x) := o[_] == x
+        p { f("1") }
+    note: "functionerrors/conflict: plain false and true result, first round"
+    query: data.test.p = x
+    want_error: functions must not produce multiple outputs for same inputs
+    want_error_code: eval_conflict_error
+  - modules:
+      - |
+        package test
+        o = ["1", "2"]
+        f(x) := o[_] == x
+        p { f("2") }
+    note: "functionerrors/conflict: plain false and true result, second round"
+    query: data.test.p = x
+    want_error: functions must not produce multiple outputs for same inputs
+    want_error_code: eval_conflict_error

test/cases/testdata/functionerrors/test-functionerrors-1012.yaml

@@ -1,32 +1,33 @@
+---
 cases:
-- data:
-  modules:
-  - |
-    package test1
+  - data:
+    modules:
+      - |
+        package test1
 
-    p(a) = y {
-      y = a[_]
-    }
+        p(a) = y {
+          y = a[_]
+        }
 
-    r = y {
-      data.test1.p([1, 2, 3], y)
-    }
-  note: functionerrors/function output conflict single
-  query: data.test1.r = x
-  want_error: functions must not produce multiple outputs for same inputs
-  want_error_code: eval_conflict_error
-- data:
-  modules:
-  - |
-    package test
+        r = y {
+          data.test1.p([1, 2, 3], y)
+        }
+    note: functionerrors/function output conflict single
+    query: data.test1.r = x
+    want_error: functions must not produce multiple outputs for same inputs
+    want_error_code: eval_conflict_error
+  - data:
+    modules:
+      - |
+        package test
 
-    f(_) = true
-    f(_) = false
+        f(_) = true
+        f(_) = false
 
-    r {
-      data.test.f(1)
-    }
-  note: functionerrors/function output conflict, used as boolean
-  query: data.test.r = x
-  want_error: functions must not produce multiple outputs for same inputs
-  want_error_code: eval_conflict_error
+        r {
+          data.test.f(1)
+        }
+    note: functionerrors/function output conflict, used as boolean
+    query: data.test.r = x
+    want_error: functions must not produce multiple outputs for same inputs
+    want_error_code: eval_conflict_error

test/cases/testdata/functionerrors/test-functionerrors-1013.yaml

@@ -1,20 +1,21 @@
+---
 cases:
-- data:
-  modules:
-  - |
-    package test2
+  - data:
+    modules:
+      - |
+        package test2
 
-    p(1, a) = y {
-      y = a
-    }
+        p(1, a) = y {
+          y = a
+        }
 
-    p(2, b) = y {
-      y = b + 1
-    }
+        p(2, b) = y {
+          y = b + 1
+        }
 
-    r = y {
-      data.test2.p(3, 0, y)
-    }
-  note: functionerrors/function input no match
-  query: data.test2.r = x
-  want_result: []
+        r = y {
+          data.test2.p(3, 0, y)
+        }
+    note: functionerrors/function input no match
+    query: data.test2.r = x
+    want_result: []

test/cases/testdata/functionerrors/test-functionerrors-1014.yaml

@@ -1,21 +1,22 @@
+---
 cases:
-- data:
-  modules:
-  - |
-    package test3
+  - data:
+    modules:
+      - |
+        package test3
 
-    p(1, a) = y {
-      y = a
-    }
+        p(1, a) = y {
+          y = a
+        }
 
-    p(x, y) = z {
-      z = x
-    }
+        p(x, y) = z {
+          z = x
+        }
 
-    r = y {
-      data.test3.p(1, 0, y)
-    }
-  note: functionerrors/function output conflict multiple
-  query: data.test3.r = x
-  want_error: functions must not produce multiple outputs for same inputs
-  want_error_code: eval_conflict_error
+        r = y {
+          data.test3.p(1, 0, y)
+        }
+    note: functionerrors/function output conflict multiple
+    query: data.test3.r = x
+    want_error: functions must not produce multiple outputs for same inputs
+    want_error_code: eval_conflict_error

test/cases/testdata/functionerrors/test-functionerrors-undefined-builtin-result.yaml

@@ -1,12 +1,13 @@
+---
 cases:
-- data:
-  modules:
-  - |
-    package test
-    foo = units.parse_bytes("1KB")
-    bar = units.parse_bytes("foo") # undefined
-  note: functionerrors/undefined builtin result
-  query: data.test = x
-  want_result:
-  - x:
-      foo: 1000
+  - data:
+    modules:
+      - |
+        package test
+        foo = units.parse_bytes("1KB")
+        bar = units.parse_bytes("foo") # undefined
+    note: functionerrors/undefined builtin result
+    query: data.test = x
+    want_result:
+      - x:
+          foo: 1000