Use regrole for job owner

[mkindahl]

Instead of using a user name to register the owner of a job, we use
regrole. This allows renames to work properly since the underlying OID
does not change when the owner name changes.

We add a check when calling DROP ROLE that there is no job with that
owner and generate an error if there is.

Fixes #5511
Fixes #5574

[codecov]

Codecov Report

Merging #5558 (fed894c) into main (20db884) will decrease coverage by 0.21%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##             main    #5558      +/-   ##
==========================================
- Coverage   90.58%   90.37%   -0.21%     
==========================================
  Files         229      229              
  Lines       47474    53993    +6519     
==========================================
+ Hits        43004    48797    +5793     
- Misses       4470     5196     +726     

Impacted Files	Coverage Δ
src/ts_catalog/catalog.h	100.00% <ø> (ø)
src/process_utility.c	94.39% <93.75%> (-0.36%)	⬇️
src/bgw/job.c	93.54% <100.00%> (-0.31%)	⬇️
src/bgw/scheduler.c	85.64% <100.00%> (-3.25%)	⬇️
tsl/src/bgw_policy/compression_api.c	83.47% <100.00%> (-2.85%)	⬇️
tsl/src/bgw_policy/continuous_aggregate_api.c	93.07% <100.00%> (-0.42%)	⬇️
tsl/src/bgw_policy/job_api.c	97.67% <100.00%> (+0.19%)	⬆️
tsl/src/bgw_policy/reorder_api.c	93.93% <100.00%> (-0.94%)	⬇️
tsl/src/bgw_policy/retention_api.c	92.51% <100.00%> (-1.65%)	⬇️

... and 196 files with indirect coverage changes

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[github-actions]

@mahipv, @lkshminarayanan: please review this pull request.

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[timescale-automation]

Automated backport to 2.10.x not done: cherry-pick failed.

Git status

HEAD detached at origin/2.10.x
You are currently cherry-picking commit 9a64385f.
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Changes to be committed:
	modified:   CHANGELOG.md
	modified:   sql/job_error_log_retention.sql
	modified:   sql/pre_install/tables.sql
	modified:   sql/with_telemetry.sql
	modified:   src/bgw/job.c
	modified:   src/bgw/job.h
	modified:   src/bgw/scheduler.c
	modified:   src/process_utility.c
	modified:   src/ts_catalog/catalog.h
	modified:   test/expected/telemetry.out
	modified:   tsl/src/bgw_policy/compression_api.c
	modified:   tsl/src/bgw_policy/continuous_aggregate_api.c
	modified:   tsl/src/bgw_policy/job_api.c
	modified:   tsl/src/bgw_policy/reorder_api.c
	modified:   tsl/src/bgw_policy/retention_api.c
	modified:   tsl/test/expected/bgw_custom.out
	modified:   tsl/test/expected/bgw_db_scheduler.out
	modified:   tsl/test/expected/bgw_db_scheduler_fixed.out
	modified:   tsl/test/sql/bgw_custom.sql
	modified:   tsl/test/sql/bgw_db_scheduler.sql
	modified:   tsl/test/sql/bgw_db_scheduler_fixed.sql

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   sql/updates/latest-dev.sql
	both modified:   sql/updates/reverse-dev.sql

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