Add tests for slice, sort, merge, out, text, bit

[SarthakDalmia1]

This is part of the #618 issue

[documentdb-triage-tool]

🤖 Auto-triaged by documentdb-triage-tool.

Applied: compatibility test, enhancement
Project fields suggested: Component test-coverage · Priority P2 · Effort L · Status In Progress
Confidence: 0.75 (mixed)

Reasoning

component from path globs (test-coverage); effort from diff stats (876+0 LOC, 7 files); LLM: Adds new compatibility test cases for multiple operators/stages (slice, sort, merge, out, text, bit) as part of a tracked issue, expanding test coverage across several areas.

If a label is wrong, remove it manually and ping @patty-chow so the rules can be tuned. The bot will not re-label items that already have component labels.