Revert "[Python] Honor disableCounterMetrics, disableStringSetMetrics, and disableBoundedTrieMetrics experiments"

[Abacn]

Reverts #38749

See #38749 (comment), and there are other breakages breaking internal imports

[gemini-code-assist]

Summary of Changes

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This pull request reverts a previous change that allowed users to disable specific metric types (Counter, StringSet, and BoundedTrie) via pipeline experiments. The reversion was necessary to resolve issues with internal imports and other breakages caused by the original implementation. The codebase has been cleaned up to remove the MetricsFlag class and all associated logic and tests.

Highlights

• Reversion of Metrics Flag Functionality: Reverted the changes that introduced MetricsFlag and the ability to disable specific metric types (Counter, StringSet, BoundedTrie) via pipeline experiments, due to internal import issues and breakages.
• Cleanup of Metrics Logic: Removed the MetricsFlag class and associated logic from metric.py, and updated DelegatingCounter, DelegatingStringSet, and DelegatingBoundedTrie to remove the conditional checks for disabled metrics.
• Removal of Pipeline Integration: Cleaned up references to MetricsFlag in pipeline.py, sdk_worker_main.py, and metric_test.py, ensuring that the initialization of pipeline options no longer attempts to set these flags.

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[Abacn]

R: @damccorm

[gemini-code-assist]

Code Review

This pull request removes the MetricsFlag class and the associated logic for disabling specific metric types (counters, string sets, and bounded tries) via pipeline options, simplifying the delegating metric classes. A review comment identifies an incorrect docstring in DelegatingBoundedTrie that refers to StringSet instead of BoundedTrie.

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