fix(NODE-7549): send afterClusterTime on writes in causally-consistent sessions

[PavelSafronov]

Description

Summary of Changes

Include afterClusterTime with WRITE commands when in a causally-consistent session.

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[Copilot]

Pull request overview

This PR updates session command decoration so that, in causally-consistent sessions, readConcern.afterClusterTime is also sent on write commands once an operationTime has been established, aligning write behavior with causal consistency requirements.

Changes:

• Add commandSupportsAfterClusterTime() and use it from applySession() to attach afterClusterTime beyond just read commands.
• Extend the unified spec runner with a dropDatabase operation for the new causal consistency test coverage.
• Add/adjust unified spec tests (including new causal-consistency unified suites) to assert afterClusterTime on writes.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/tools/unified-spec-runner/operations.ts	Adds dropDatabase unified operation used by new causal consistency unified specs.
test/spec/transactions/unified/retryable-writes.yml	Updates expected command monitoring to require readConcern.afterClusterTime on retryable writes.
test/spec/transactions/unified/retryable-writes.json	JSON equivalent updates for retryable writes expectations.
test/spec/transactions/unified/commit.yml	Updates expected command monitoring to require readConcern.afterClusterTime on relevant writes.
test/spec/transactions/unified/commit.json	JSON equivalent updates for commit suite expectations.
test/spec/transactions-convenient-api/unified/callback-commits.yml	Updates expectations to require afterClusterTime in command readConcern.
test/spec/transactions-convenient-api/unified/callback-commits.json	JSON equivalent updates for callback commits expectations.
test/spec/transactions-convenient-api/unified/callback-aborts.yml	Updates expectations to require afterClusterTime in command readConcern.
test/spec/transactions-convenient-api/unified/callback-aborts.json	JSON equivalent updates for callback aborts expectations.
test/spec/causal-consistency/unified/causal-consistency-write-commands.yml	Adds new unified causal-consistency coverage for afterClusterTime on a variety of write commands.
test/spec/causal-consistency/unified/causal-consistency-write-commands.json	JSON equivalent of the new causal-consistency write command suite.
test/spec/causal-consistency/unified/causal-consistency-clientBulkWrite.yml	Adds new unified causal-consistency coverage for afterClusterTime on clientBulkWrite.
test/spec/causal-consistency/unified/causal-consistency-clientBulkWrite.json	JSON equivalent of the new causal-consistency clientBulkWrite suite.
test/integration/causal-consistency/causal_consistency.spec.test.ts	Wires the new causal-consistency unified specs into the integration test suite.
src/utils.ts	Introduces commandSupportsAfterClusterTime() allowlist for commands eligible for afterClusterTime.
src/sessions.ts	Switches causal-consistency decoration to use commandSupportsAfterClusterTime() (enabling writes).