Add temporary ID support for create_issue safe output (#4698)

* Initial plan

* Add temporary ID support for create_issue safe output

- Generate 12-char hex temporary IDs for issues created via safe outputs
- Store temporary_id -> issue_number mapping in job output
- Replace #temp:ID references in issue body with resolved issue numbers
- Support parent field referencing temporary IDs for sub-issue linking
- Pass temporary_id_map to add-comment job for reference resolution
- Add comprehensive tests for temporary ID functionality

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Extract temporary ID functions to shared utility module

- Create temporary_id.cjs with shared functions for temporary ID handling
- Update create_issue.cjs and add_comment.cjs to use shared utility
- Add temporary_id.cjs to embedded JavaScript sources for bundling
- Add comprehensive tests for temporary_id.cjs module

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Change temporary ID pattern to use aw_ prefix

Updated the temporary ID format from #temp:XXXXXXXXXXXX to #aw_XXXXXXXXXXXX
as requested. The new format:
- Generated IDs: aw_ prefix + 12 hex characters (e.g., aw_abc123def456)
- Reference pattern: #aw_XXXXXXXXXXXX (e.g., #aw_abc123def456)
- Case-insensitive matching for references

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Author: Copilot