Tensorboard features: remember the url and vscode tab renaming

[twni2016]

Hi VSCode Python Team,

Thank you for your features to incorporating Tensorboard into vscode. When using it I found two potential features for improvement:

• If we click the tabs in tensorboard UI, it will update the url by adding #tab, e.g. I'd like to use time series tab in tensorboard (introduced in v2.4.0 which can pin the desired tags). The url will be updated in the form of original_url:/?pinnedCards=<tags>#timeseries. However, current vscode tab won't remember this new url, so each time I reenter the tensorboard tab in the vscode, it just refresh the original url.
• Rename the vscode tabs: if we open multiple tensorboard tabs, they all have same name as tensorboard. I think it would be convenient for users to rename the tabs, or simply use the logdir as the tab name.
  Thanks!

[brettcannon]

Moved to #17174