[DOP-39512] Remove fastapi dependeciy_override and Stub

[TiGrib]

Change Summary

Remove fastapi dependeciy_override and Stub to speed up application

Related issue number

[DOP-39512]

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[github-actions]

Coverage Report •

File	Stmts	Miss	Branch	BrPart	Cover	Missing
syncmaster/db
factory.py	16	5	0	0	69%	20, 36–38, 40
syncmaster/server
__init__.py	35	3	0	0	91%	67–69
syncmaster/server/api/v1
auth.py	30	2	0	0	93%	32, 41
runs.py	64	6	12	2	89%	100->101, 101, 132–134, 138, 159->160, 160
syncmaster/server/dependencies
__init__.py	2	2	0	0	0%	4, 6
syncmaster/server/providers/auth
dummy_provider.py	61	25	6	4	57%	54–56, 58–63, 65–68, 70–72, 79–80, 84, 89, 99–101, 111, 115
keycloak_provider.py	86	17	10	3	79%	61, 78–80, 111–113, 115->116, 116–117, 123->124, 124–125, 153->154, 154–155, 159–162
oauth2_gateway_provider.py	55	14	6	2	74%	46->47, 47–49, 53–56, 66->67, 67–68, 78–79, 98, 111, 117
syncmaster/server/services
get_user.py	32	3	12	2	89%	47->49, 49, 59->60, 60–61
TOTAL	5353	640	826	171	87%