[PRODCRE-1483] obs stack fixed location

[Tofel]

With this change we'd always extract observability files to a fixed location: ~/./local/share/ctf instead of to the current directory. Why? So that we can execute obs/bs commands in different contexts.

Currently, if you run ctf obs u in one folder, then teardown via ctf obs d run in another directly won't work, because Docker compose file will be missing. With the change commands become independent of execution context. Plus they limit the possibility of committing extracted files by mistake, if the up command was run in repo, that doesn't have these files in .gitignore.

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Why

The changes centralize and organize observability resources into a user's home directory, improving file management and accessibility. This standardization simplifies navigating, updating, and maintaining observability components by having a consistent directory structure across different environments.

What

• framework/observability.go
  • Added a constant CTFCacheDir representing the directory path .local/share/ctf for storing observability files.
  • Introduced a new function getObservabilityDir to construct and return the observability directory path based on the user's home directory.
  • Modified extractAllFiles function to extract files into the observability directory instead of the current directory.
  • Updated BlockScoutUp, BlockScoutDown, ObservabilityUpOnlyLoki, ObservabilityUp, and ObservabilityUpFull functions to use the observability directory for operations.
  • Altered ObservabilityDown function to remove resources from the new observability directory structure.

[github-actions]

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[Copilot]

Pull request overview

This PR modifies the observability stack to extract files to a fixed directory in the user's home directory (~/.local/share/ctf) instead of the current working directory, and removes the cleanup of these files on teardown.

Key Changes:

• Observability files are now extracted to ~/.local/share/ctf instead of the current working directory
• Teardown functions no longer delete the extracted observability files
• All observability functions now use the fixed directory path for docker compose operations

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