Fix crash on Edit Code

[mkondratek]

Closes https://linear.app/sourcegraph/issue/QA-180/jetbrains-crash-occurred-while-clicking-on-edit-code-after-restarting.

Test plan

See the linear issue.
You can try removing AccountData entry from workspace.xml before opening the project.

Changes

First I tried to simply setActiveAccount for the deprecated manager. This is not the best solution as do not know some values for the account (name, displayName, id). We could hardcode some values but we would be persisting some artificial data for a simple task that is - all we need is to store the llm that was used for Edit Prompt most recently.

So instead of hacking & mocking the deprecated logic (HistoryService is used basically only for history reasons, migrations, etc)... instead of that, let's simply use a simply dedicated storage class.

Also, it could be an actual storage with a corresponding storage file (.xml) but do we really need it? Project session persistence should the enough for most users.

[pkukielka]

LGTM

[sourcegraph-release-bot]

The backport to jb-v7.4.x failed at https://github.com/sourcegraph/jetbrains/actions/runs/12067657791:

Reviews may only be requested from collaborators. One or more of the teams you specified is not a collaborator of the sourcegraph/jetbrains repository.

To backport this PR manually, you can either:

Via the sg tool

Use the sg backport command to backport your commit to the release branch.

sg backport -r jb-v7.4.x -p 2699

Via your terminal

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-jb-v7.4.x jb-v7.4.x
# Navigate to the new working tree
cd .worktrees/backport-jb-v7.4.x
# Create a new branch
git switch --create backport-2699-to-jb-v7.4.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 c3211191996b35e745c9b0988d1f2a8018154479
# Push it to GitHub
git push --set-upstream origin backport-2699-to-jb-v7.4.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-jb-v7.4.x

If you encouter conflict, first resolve the conflict and stage all files, then run the commands below:

git cherry-pick --continue
# Push it to GitHub
git push --set-upstream origin backport-2699-to-jb-v7.4.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-jb-v7.4.x

• Follow above instructions to backport the commit.
• Create a pull request where the base branch is jb-v7.4.x and the compare/head branch is backport-2699-to-jb-v7.4.x., click here to create the pull request.

Once the pull request has been created, please ensure the following:

• Make sure to tag @sourcegraph/release in the pull request description.

• kindly remove the release-blocker from this pull request.