Use reference of PoolingHttpClientConnectionManager instead of HttpClientConnectionManager for Connection Manager

[joviegas]

Motivation and Context

• Use reference of PoolingHttpClientConnectionManager instead of HttpClientConnectionManager for Connection Manager
• PoolingHttpClientConnectionManager has apis related to Closing Idle connections

Modifications

• Replace references of ConnectionManager as PoolingHttpClientConnectionManager instead of HttpClientConnectionManager

Testing

• Updated Test case where closeIdle is tested
• Also tested one-off S3 integ test where initially it was failing for large get/put object

License

• I confirm that this pull request can be released under the Apache 2 license

[sonarqubecloud]

Quality Gate failed

Failed conditions
64.1% Coverage on New Code (required ≥ 80%)
23.3% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

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