Do not force VS Code settings

[tbradsha]

We currently prevent users from configuring their VS Code workspace when working in the Jetpack monorepo. This provides a bad user experience.

This PR proposes moving the "sanctioned" settings to settings.dist.json, available for the user to copy as desired.

It also introduces a tools/install-vscode-settings.sh script that will copy the settings template file in place if one doesn't yet exist.

Finally, it introduces a .vscode/task.json file that will run said script when opening the folder in VS Code (so long as scripts are enabled in VS Code). One can manually trigger this in VS Code with the "Run Tasks" command.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

[github-actions]

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[tbradsha]

Pending discussion here: p1HpG7-sQE-p2

[tbradsha]

Looks like #37505 pushed more changes to .vscode/settings.json...

[tbradsha]

Rebased.

[manzoorwanijk]

Thank you for working on this.