[DOP-39630] Hide secrets while logging settings value

[dolfinus]

Change Summary

Discovered in MTSWebServices/horizon#227

Related issue number

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
• mddocs/docs/changelog/next_release/<pull request or issue id>.<change type>.md 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
data_rentgen/consumer
__init__.py	84	21	8	5	72%	47->50, 50–54, 56, 61->74, 102, 129–132, 134, 136–140, 143->146, 159–162
data_rentgen/db
settings.py	27	7	4	2	71%	16->17, 17–18, 21->22, 22–23, 72, 75–76
data_rentgen/http2kafka
__init__.py	53	17	2	2	65%	37–42, 44, 46–50, 54, 99–102
data_rentgen/server
__init__.py	30	4	0	0	87%	57–60
data_rentgen/server/providers/auth
dummy_provider.py	59	6	6	1	89%	71–73, 91->92, 92–93, 109
keycloak_provider.py	101	13	14	3	86%	65, 79–82, 103->104, 104, 109->110, 110–111, 143–145, 163->164, 164–165
personal_token_provider.py	105	9	22	3	91%	34->35, 35, 116–118, 131->132, 132–133, 137->138, 138–140
data_rentgen/server/settings/auth
__init__.py	16	3	2	1	78%	43->44, 44–45, 50
TOTAL	7600	499	1276	207	92%