feat: Upgrade OTel Collector to version 0.120.0 (contrib 0.120.1)

[hisarbalik]

Description

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

• Bump OTel image version to 0.120.0
• Bump OTel contrib version to 0.120.1
• Update transform processor statements with new flat expressions
• Fix issue, prometheus namespace filter not working for metrics otelcol_*
• Add new annotation telemetry.kyma-project.io/internal-metrics-compatibility-mode to the telemetry resource to enabled backward compatibility for OTel internal metrics
• Add benchmark test result for OTel version 0.120.0
• Add e2e test with compatibility mode enabled for metric pipeline self-monitor healthy path

Changes refer to particular issues, PRs or documents:

• chore: update opentelemetry to 0.120.0 opentelemetry-collector-components#264
• [service] Internal counter metrics now have a _total suffix in Prometheus open-telemetry/opentelemetry-collector#12458
• chore: update opentelemetry to 0.119.0 opentelemetry-collector-components#253

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.

[a-thaler]

I cannot find the changes for the self-monitor, compensating the missing _total suffix

rakesh takes over