feat: add multiple DevLake tools and improvements

[flacatus]

• Add get_lead_time_for_changes DORA metric tool
• Add codecov_tools for code coverage analysis
• Add e2e_test_tools for E2E test tracking
• Add github_actions_tools for CI/CD insights
• Add historical_trends_tools for week-over-week analysis
• Add jira_tools for Jira features retrieval
• Add pr_cycle_time_tools for PR metrics
• Add pr_stats_tools for PR statistics
• Update incident_tools with DORA alignment
• Update pr_retest_tools
• Register all new tools in tools_manager

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 56.15171% with 474 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.46%. Comparing base (bef5536) to head (13bbad8).
⚠️ Report is 27 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/devlake/e2e_test_tools.py	13.74%	113 Missing ⚠️
tools/devlake/pr_stats_tools.py	14.41%	95 Missing ⚠️
tools/devlake/pr_cycle_time_tools.py	16.16%	83 Missing ⚠️
tools/devlake/github_actions_tools.py	20.00%	64 Missing ⚠️
tools/devlake/codecov_tools.py	80.87%	33 Missing and 15 partials ⚠️
tools/devlake/pr_retest_tools.py	3.12%	31 Missing ⚠️
tools/devlake/historical_trends_tools.py	90.81%	9 Missing and 8 partials ⚠️
tools/devlake/lead_time_tools.py	85.91%	5 Missing and 5 partials ⚠️
tools/devlake/jira_tools.py	88.13%	5 Missing and 2 partials ⚠️
tools/devlake/incident_tools.py	88.88%	1 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   47.54%   51.46%   +3.92%     
==========================================
  Files          27       38      +11     
  Lines        1424     2860    +1436     
  Branches      178      391     +213     
==========================================
+ Hits          677     1472     +795     
- Misses        724     1326     +602     
- Partials       23       62      +39     

Flag	Coverage Δ
unit-tests	51.46% <56.15%> (+3.92%)	⬆️

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