Rename InMemoryLogExporter to InMemoryLogRecordExporter

[hectorhdzg]

Description

Rename the following classes to maintain consistency with specs and other languages implementations, only used in tests for this repo.
InMemoryLogExporter to InMemoryLogRecordExporter

Does This PR Require a Core Repo Change?

• Yes. - Link to PR: [logs-api/sdk] Rename several classes from Log to LogRecord opentelemetry-python#4647
• No.

[hectorhdzg]

I removed alias and reverted to original changes; this is not blocking SDK side rename PR anymore so this can be merged when SDK is released, let me know if there is any other feedback.

[xrmx]

I removed alias and reverted to original changes; this is not blocking SDK side rename PR anymore so this can be merged when SDK is released, let me know if there is any other feedback.

While this may be fine for CI, for the genai instrumentations that are not tied to a single opentelemetry version there's no guarantee they are running against latest sdk so we need to handle both or bump the baseline.

From google-genai instrumentation pyproject.toml:

  "opentelemetry-api >=1.31.1, <2",
  "opentelemetry-instrumentation >=0.52b1, <2",
  "opentelemetry-semantic-conventions >=0.52b1, <2"