Add S3 custom 503 throttling detection

[RanVaknin]

Addresses #5414

S3's RestXML protocol sends the response's error information in the response body. Since S3 head* operations do not have a body, we need to infer what kind of exception it is from the error message. In case of throttling, S3 will send:

HTTP/1.1 503 Slow Down

We need to grab the status code (503) and status text ("Slow Down") and use those two to infer that the server throttled the request.

We already have an execution interceptor for S3 that extracts info from head operation responses. All this PR does is adds one more logic branch that handles extracting the error info from the slow down responses, and create the appropriate S3Exception that will get classified as ThrottlingException and will apply the appropriate retry mechanism

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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