LOGC-6: Implement S3 uploader

[dvasilas]

This PR implements S3 integration to enable log-courier to write log objects to S3.

It sets up Metadata, Vault, and CloudServer in the CI for testing.

[BourgoisMickael]

Suggested change

	image: ghcr.io/scality/cloudserver:7.70.77
	image: ghcr.io/scality/cloudserver:9.0.32

https://github.com/scality/Federation/blob/development/9.5/group_vars/all#L203

[dvasilas]

I think we cannot directly bump to version 9, we need to update the cloud server config. I created https://scality.atlassian.net/browse/WKBCH-9 to do it separately.

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.69%. Comparing base (74ff315) to head (a0b80c4).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/logcourier/config.go	33.33%	2 Missing and 2 partials ⚠️
pkg/s3/client.go	94.11%	1 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
pkg/s3/uploader.go	100.00% <100.00%> (ø)
pkg/testutil/clickhouse.go	88.26% <100.00%> (+0.06%)	⬆️
pkg/s3/client.go	94.11% <94.11%> (ø)
pkg/logcourier/config.go	80.00% <33.33%> (-20.00%)	⬇️

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
+ Coverage   84.22%   84.69%   +0.46%     
==========================================
  Files           9       11       +2     
  Lines         450      503      +53     
==========================================
+ Hits          379      426      +47     
- Misses         52       55       +3     
- Partials       19       22       +3     

Flag	Coverage Δ
unit	84.69% <90.00%> (+0.46%)	⬆️

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