docs: add profilingmetrics use case and configuration options

[rogercoll]

Elastic-agent docs being updated accordingly elastic/elastic-agent#13547

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Reviewing files that changed from the base of the PR and between 7257555 and 9cdf7a6.

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• connector/profilingmetricsconnector/README.md

📝 Walkthrough

Walkthrough

The README for the Profiling Metrics Connector was substantially expanded. Documentation updates include capitalization of the title, addition of an autogenerated status section, and a "Supported Pipeline Types" table. The Overview section was extended to explain frame classification, delta metric derivation, optional gauges, and custom regex-based aggregations. Configuration documentation was restructured to provide both minimal and comprehensive examples, introducing new flush_interval and aggregations fields. The metric dependencies warning was updated with specific guidance on required metrics. References to related documentation and the Elastic Profiling Metrics integration were added.

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[christos68k]

Left some terminology nits, otherwise LGTM

[christos68k]

Thanks!