Add multi-repo enterprise context

[pkukielka]

Test plan

1. Open sourcegraph/cody project with non-enterprise account.

• Open new chat and ask question about current repo (e.g. some class) - assistant should know the answer
• Open new chat and ask question about squirrel - assistant should describe you an animal
• Open new chat and disable local context. Ask about current repo (e.g. some class) - assistant should not have a context
• Save current context as default. Close the IDE. Reopen the IDE.
  • Go to Chat History tab and open previous chats one by one. Check if both history and context settings are properly preserved.
  • Open new chat and check if context is disabled. It should be, as we previously set that as new default. Enable it again and set as default.

2. Open sourcegraph/cody project with enterprise account.

• All checks from point 1) apply there as well.
• Click [+] button in the context panel and type sourcegraph repo url (github.com/sourcegraph/sourcegraph)
  • Check if validator blocks from entering incomplete or invalid URL
  • Add the sourcegraph/sourcegraph repo by hitting Add button
• Open new chat and ask question about squirrel - assistant should describe you an HTTP server, NOT animal.
• Set new configuration as default and open new chat. It should use previous context configuration.
• Disable sourcegraph/sourcegraph remote repo context.
• Ask question about squirrel. It should be back to describing you an animal or having no context.
• Save current context as default. Close the IDE. Reopen the IDE.
  • Go to Chat History tab and open previous chats one by one. Check if both history and context settings are properly preserved.
  • Open new chat and check if sourcegraph/sourcegraph is disabled. It should be, as we previously set that as new default. Enable it again and set as default.
  • Open new chat and check if sourcegraph/sourcegraph is enabled, it should be.
  • Remove sourcegraph/sourcegraph repo by clicking on it to select it, and then clicking [-] button.
  • Ask question about squirrel. It should be back to describing you an animal or having no context.

Changes

• Added multi-repo enterprise context
• Improved look of the local context panel
• Fixed several bugs like:
  • history service being instantiated as application-wide service instead of project-wide
  • current repo url parsing and timing issues