Migrate to AWS SDK v2

[hpoettker]

The PR migrates the AWS SDK from v1 to v2 and resolves #2038.

I'm quite happy with the current state but there are some open points:

• The integration with AWS CodeCommit needs to be tested manually as the Community Edition of LocalStack does not support it.
• AFAICT there is currently no release of Spring Cloud AWS with the v2 SDK. But this could also be addressed in a follow-up step to resolve Serving plain-text files with S3 Backend not working #1939.

[codecov]

Codecov Report

Merging #2099 (cd4662b) into main (d8f6341) will increase coverage by 0.05%.
The diff coverage is 84.84%.

@@             Coverage Diff              @@
##               main    #2099      +/-   ##
============================================
+ Coverage     77.72%   77.77%   +0.05%     
+ Complexity     1474     1473       -1     
============================================
  Files           183      183              
  Lines          5395     5381      -14     
  Branches        707      706       -1     
============================================
- Hits           4193     4185       -8     
+ Misses          935      929       -6     
  Partials        267      267              

Impacted Files	Coverage Δ
...ver/config/EnvironmentRepositoryConfiguration.java	74.64% <ø> (ø)
.../server/support/GitCredentialsProviderFactory.java	87.50% <0.00%> (ø)
...erver/support/AwsCodeCommitCredentialProvider.java	82.75% <64.28%> (+0.94%)	⬆️
...entication/AwsIamClientAuthenticationProvider.java	65.21% <66.66%> (+3.67%)	⬆️
...server/environment/AwsS3EnvironmentRepository.java	89.41% <94.11%> (-0.13%)	⬇️
...server/environment/AwsClientBuilderConfigurer.java	80.00% <100.00%> (-5.72%)	⬇️
...onment/AwsParameterStoreEnvironmentRepository.java	100.00% <100.00%> (ø)
...AwsParameterStoreEnvironmentRepositoryFactory.java	100.00% <100.00%> (ø)
...environment/AwsS3EnvironmentRepositoryFactory.java	100.00% <100.00%> (ø)
...onment/AwsSecretsManagerEnvironmentRepository.java	96.15% <100.00%> (+3.42%)	⬆️
... and 3 more

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[hpoettker]

This PR has been superseded by #2111, I guess.

If a PR is not welcome or no help is wanted, a short comment and closing the PR would be appreciated.

I'll keep it open in case you're interested in the integration tests. I found them useful.