docs: Validate the LogPipeline OTel Setup and test the performance of the log agent

[TeodorSAP]

Description

Changes proposed in this pull request (what was done and why):

• Propose a log agent OTel setup
• Perform benchmarking and load tests for the log agent setup in both normal and backpressure scenarios
• Document the steps, results, and conclusions of the validation and load tests performed on the setup
• Minor changes to existing documentation/sample files

Changes refer to particular issues, PRs or documents:

• Resolves Validate new OTLP log setup #1631

Traceability

• The PR is linked to a GitHub issue.
• The follow-up issues (if any) are linked in the Related Issues section.
• If the change is user-facing, the documentation has been adjusted.
• If a CRD is changed, the corresponding Busola ConfigMap has been adjusted.
• The feature is unit-tested.
• The feature is e2e-tested.