Improve k6 perf test results consistency

[xin-hedera]

Description:

This PR makes k8s deployment resources changes for better k6 perf tests consistency

• Set cpu resources requests to limits for rest, restjava, and web3
• Set HPA target CPU utilization to 40% for rest, restjava, and web3

Related issue(s):

Fixes #8596

Notes for reviewer:

The changes have been tested and the results are in notion for v0.107.0-rc1, the #2 run. Note most RPS are better than that of v0.106.0-rc1, some web3 tests showed 3 times higher RPS.

Checklist

• [x] Documented (Code comments, README, etc.)
• [x] Tested (unit, integration, etc.)