[confmap] Allow using map[string]any as string (#10615)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

<!-- Issue number if applicable -->

Allow using strings parseable in YAML as `map[string]any` in inline
position

#### Link to tracking issue

Relates to #10605 (does not fix it since it's not in inline position)

Author: mx-psi

.chloggen/mx-psi_make-map-string-any-convertible.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: confmap
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Allow using `map[string]any` values in string interpolation
+
+# One or more tracking issues or pull requests related to the change
+issues: [10605]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

confmap/internal/e2e/types_test.go

@@ -303,12 +303,12 @@ func TestStrictTypeCasting(t *testing.T) {
 		{
 			value:       "{\"field\": 123}",
 			targetField: TargetFieldInlineString,
-			resolveErr:  "retrieved value does not have unambiguous string representation",
+			expected:    "inline field with {\"field\": 123} expansion",
 		},
 		{
 			value:       "1111:1111:1111:1111:1111::",
 			targetField: TargetFieldInlineString,
-			resolveErr:  "retrieved value does not have unambiguous string representation",
+			expected:    "inline field with 1111:1111:1111:1111:1111:: expansion",
 		},
 		{
 			value:        "1111:1111:1111:1111:1111::",

confmap/provider.go

@@ -141,7 +141,7 @@ func NewRetrievedFromYAML(yamlBytes []byte, opts ...RetrievedOption) (*Retrieved
 	switch v := rawConf.(type) {
 	case string:
 		opts = append(opts, withStringRepresentation(v))
-	case int, int32, int64, float32, float64, bool:
+	case int, int32, int64, float32, float64, bool, map[string]any:
 		opts = append(opts, withStringRepresentation(string(yamlBytes)))
 	}
 

confmap/provider_test.go

@@ -113,9 +113,8 @@ func TestNewRetrievedFromYAMLString(t *testing.T) {
 			value: 0.123,
 		},
 		{
-			yaml:       "{key: value}",
-			value:      map[string]any{"key": "value"},
-			strReprErr: "retrieved value does not have unambiguous string representation",
+			yaml:  "{key: value}",
+			value: map[string]any{"key": "value"},
 		},
 	}