chore: remove getWorkspaceConfigs

[RomneyDa]

Description

• Only load .continuerc.json for JSON config loading
• Remove duplicate getWorkspaceConfigs logic

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Summary by cubic

Simplified workspace config loading by only reading .continuerc.json files and removing duplicate getWorkspaceConfigs logic.

• Refactors
  • Moved workspace config file reading into a single function.
  • Removed getWorkspaceConfigs from IDE interfaces and extensions.

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[cubic-dev-ai]

cubic reviewed 13 files and found no issues. Review PR in cubic.dev.