Remove unused jira-escalation command and SlackClient bot integration

[amp-rh]

Summary

Removes dead code that was never wired up to any CI job or Prow step:

• src/commands/jira_escalation.py — CLI command
• src/escalation/jira_escalation.py — escalation logic
• src/objects/slack_base.py — SlackClient bot token integration
• Associated tests

Why

The jira-escalation command and SlackClient (bot token based) existed in the codebase but were never referenced in the step registry or any Prow job config. SLACK_BOT_TOKEN was never injected anywhere in CI.

Slack notifications for the report command are handled via incoming webhook in #274, which requires no bot token or SDK.

Test plan

• Unit tests pass (uv run pytest tests/unittests/)
• firewatch --help no longer lists jira-escalation

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[redhat-chai-bot]

Code Review Summary

Clean deletion-only PR — 0 additions, 1,003 deletions across 7 files. CI is green ✅

What looks good

• Complete removal — source files, CLI command registration, tests, and the package __init__.py are all removed together. No orphaned code or dead tests left behind.
• CLI entry point is clean — cli.py changes are minimal and correct; only the import and add_command for jira_escalation are removed. The remaining commands (report, jira_config_gen) are untouched.
• CI passes — unit-test suite still passes, confirming nothing outside the escalation module depended on the removed code.
• No logic changes — pure deletion, so no risk of introducing regressions.

One item to address

• ⚠️ slack-sdk is still listed as a dependency in pyproject.toml — since SlackClient in src/objects/slack_base.py appears to be the sole consumer of slack-sdk, verify that nothing else in the repo imports slack_sdk. If nothing does, remove "slack-sdk>=3.35.0" from the dependencies list to avoid shipping an unnecessary runtime dependency.

Minor observations (non-blocking)

• Confirm that no CI jobs, Dockerfiles, or wrapper scripts invoke firewatch jira-escalation externally — since the CLI subcommand is being removed, any external callers would break at runtime.
• The tests/unittests/functions/escalation/ and tests/unittests/objects/slack/ directories should be empty after the deletions — Git doesn't track empty directories so this should be fine, but worth a quick check.

Overall: Well-scoped cleanup PR. Once the slack-sdk dependency question is addressed, this looks good to merge. 👍