Refactor(utils): Consolidate response handling into utility functions

Refactor(utils): Consolidate response handling into utility functions

Abstracted common HTTP response validation and metric recording logic into reusable utility functions:

- Added `validateAndRecordMetric` for generalized response checks and metric recording.
- Introduced `processHttpResponseWithOverheadMetrics` to handle response times adjusted for known delays.
- Created `validateResponseAndRecordMetric` to validate JSON response lengths and record metrics.

These changes promote code reuse and maintain consistency across test scenarios.

Issue-ID: CPS-2690
Change-Id: Ie4dd1075c65e87c1b48225e096b2b781b098da0f
Signed-off-by: sourabh_sourabh <sourabh.sourabh@est.tech>