PM-4836: Place review action on reviewer row

[jmgasper]

What was broken

The review table rendered the current reviewer action only on the first reviewer row for a submission. When a copilot reviewer was the second reviewer, Complete Review appeared beside the other reviewer.

Root cause

The actions cell looked up the current user's review across the whole submission while the table only rendered actions for the first flattened reviewer row.

What was changed

Reviewer-owned actions now resolve against the flattened row's reviewer index, so Complete Review, Review Complete, and Reopen Review render on the row for the matching reviewer resource. Submission-level actions still render only on the first row to avoid duplicates.

Any added/updated tests

Added regression coverage for a two-reviewer row set where the current reviewer is not first, ensuring only that reviewer row is action-eligible.

Validation run:

• yarn lint passed.
• yarn test:no-watch src/apps/review/src/lib/components/common/reviewResult.spec.ts passed.
• yarn run build passed with existing warnings.
• yarn test:no-watch was run and failed in unrelated wallet/work/engagement suites, including missing modules under wallet-admin and missing assignment utility exports in work engagement tests.