Provides webviewId to merge conflicts wrapper

[nzaytsev]

Description

Wanted to provide webviewId as context (and implemented, but then reverted), but the command registration on graphWebview side is a bit incorrect, it always handles events of gitlens.views.graph

So, I provide webviewId from graphWrapper and check inside the MergeConflictWarning, then pick between createWebviewCommandLink and createCommandLink. It's bad that there are several types for commands and webviewIds, it's not easy to unify it now

Checklist

• I have followed the guidelines in the Contributing document
• My changes follow the coding style of this project
• My changes build without any errors or warnings
• My changes have been formatted and linted
• My changes include any required corresponding changes to the documentation (including CHANGELOG.md and README.md)
• My changes have been rebased and squashed to the minimal number (typically 1) of relevant commits
• My changes have a descriptive commit message with a short title, including a Fixes $XXX - or Closes #XXX - prefix to auto-close the issue that your PR addresses

[d13]

Resolved with 4f0d3d7