[chore]: Rename strategyProvider field to provider for naming consistency

[aaryan359]

Requirement

Summary

There is a small naming inconsistency in the remote sampling extension.

In cmd/jaeger/internal/extension/remotesampling/extension.go, the struct contains a field named strategyProvider of type samplingstrategy.Provider. A TODO comment in the code indicates that this field should be renamed to Provider (not a “store”) to better reflect its purpose and align with the actual type.

Motivation

• Improves naming clarity and consistency
• Avoids confusion between provider and store concepts (e.g. adaptiveStore)
• Addresses existing acknowledged technical debt

Proposed Change

• Rename strategyProvider to provider
• Update all internal references and related tests

Impact

This is a safe internal refactor:

• No public API changes
• No behavioral changes
• No configuration impact

[aaryan359]

@yurishkuro @jkowall
I found a TODO related to renaming strategyProvider for consistency and submitted a small refactor. Let me know if this approach looks okay.

[jkowall]

Copilot is reviewing it now.