refactor(telemetry-utlis): Make MockLogger internal (microsoft#23473)

## Description

Removes the `MockLogger` class from the `@alpha+@legacy` API surface. It
has been deprecated for external use since 2024-06-18.

Note: originally merged in
microsoft#23010 and reverted in
microsoft#23035 because it hadn't
been announced previously as part of the breaking changes in 2.10.

## Breaking Changes

- `MockLogger` is now removed from the `@alpha+@legacy` API surface,
becoming only `@internal`.

.changeset/green-readers-burn.md

@@ -0,0 +1,13 @@
+---
+"@fluidframework/telemetry-utils": minor
+---
+---
+"section": legacy
+---
+
+MockLogger has been removed from the alpha+legacy API surface
+
+The `MockLogger` class previously exposed in the alpha+legacy API surface of `@fluidframework/telemetry-utils` has
+been removed.
+No replacement is provided, as this class was only intended for use in testing scenarios, and should be trivial to
+re-implement in any codebase that still uses it.

packages/utils/telemetry-utils/api-report/telemetry-utils.legacy.alpha.api.md

@@ -55,24 +55,6 @@ export interface ITelemetryPerformanceEventExt extends ITelemetryGenericEventExt
 // @alpha
 export type ITelemetryPropertiesExt = Record<string, TelemetryEventPropertyTypeExt | Tagged<TelemetryEventPropertyTypeExt>>;
 
-// @alpha @deprecated
-export class MockLogger implements ITelemetryBaseLogger {
-    constructor(minLogLevel?: LogLevel);
-    assertMatch(expectedEvents: Omit<ITelemetryBaseEvent, "category">[], message?: string, inlineDetailsProp?: boolean, clearEventsAfterCheck?: boolean): void;
-    assertMatchAny(expectedEvents: Omit<ITelemetryBaseEvent, "category">[], message?: string, inlineDetailsProp?: boolean, clearEventsAfterCheck?: boolean): void;
-    assertMatchNone(disallowedEvents: Omit<ITelemetryBaseEvent, "category">[], message?: string, inlineDetailsProp?: boolean, clearEventsAfterCheck?: boolean): void;
-    assertMatchStrict(expectedEvents: Omit<ITelemetryBaseEvent, "category">[], message?: string, inlineDetailsProp?: boolean, clearEventsAfterCheck?: boolean): void;
-    clear(): void;
-    get events(): readonly ITelemetryBaseEvent[];
-    matchAnyEvent(expectedEvents: Omit<ITelemetryBaseEvent, "category">[], inlineDetailsProp?: boolean, clearEventsAfterCheck?: boolean): boolean;
-    matchEvents(expectedEvents: Omit<ITelemetryBaseEvent, "category">[], inlineDetailsProp?: boolean, clearEventsAfterCheck?: boolean): boolean;
-    matchEventStrict(expectedEvents: Omit<ITelemetryBaseEvent, "category">[], inlineDetailsProp?: boolean, clearEventsAfterCheck?: boolean): boolean;
-    readonly minLogLevel: LogLevel;
-    send(event: ITelemetryBaseEvent, logLevel?: LogLevel): void;
-    // (undocumented)
-    toTelemetryLogger(): ITelemetryLoggerExt;
-}
-
 // @alpha
 export type TelemetryEventCategory = "generic" | "error" | "performance";
 

packages/utils/telemetry-utils/src/mockLogger.ts

@@ -25,28 +25,7 @@ import type {
  * Records events sent to it, and then can walk back over those events, searching for a set of expected events to
  * match against the logged events.
  *
- * @deprecated
- *
- * This class is not intended for use outside of the `fluid-framework` repo, and will be removed from
- * package exports in the near future.
- *
- * Please migrate usages by either creating your own mock {@link @fluidframework/core-interfaces#ITelemetryBaseLogger}
- * implementation, or by copying this code as-is into your own repo.
- *
- * @privateRemarks TODO: When we are ready, this type should be made `internal`, and the deprecation notice should be removed.
- *
- * @deprecated
- *
- * This class is not intended for use outside of the `fluid-framework` repo, and will be removed from
- * package exports in the near future.
- *
- * Please migrate usages by either creating your own mock {@link @fluidframework/core-interfaces#ITelemetryBaseLogger}
- * implementation, or by copying this code as-is into your own repo.
- *
- * @privateRemarks TODO: When we are ready, this type should be made `internal`, and the deprecation notice should be removed.
- *
- * @legacy
- * @alpha
+ * @internal
  */
 export class MockLogger implements ITelemetryBaseLogger {
 	/**