Add additional files and directories to vscodeignore

[dotNomad]

This PR adds a few directories and files to the .vscodeignore file which prevents those files being bundled into the extension:

• A CONTRIBUTING doc
• A vitest and fantasticon configuration file
• And the coverage directory in case that ever sneaks in during the CI

To see what files are bundled you can go to the extensions/vscode directory and run: npx vsce ls which will utilize the vscode:prepublish script and show what files are included.

After this PR the list is:

assets/img/posit-publisher.png
assets/walkthroughs/activate-extension.png
assets/walkthroughs/create-new-deployment.png
assets/walkthroughs/deploy.png
assets/walkthroughs/edit-configuration.png
assets/walkthroughs/open-folder.png
assets/walkthroughs/visit-content.png
bin/publisher
CHANGELOG.md
dist/extension.js
dist/extension.js.map
dist/posit-publisher-icons.css
dist/posit-publisher-icons.html
dist/posit-publisher-icons.json
dist/posit-publisher-icons.woff2
LICENSE
package.json
README.md
SUPPORT.md
webviews/homeView/dist/index.css
webviews/homeView/dist/index.html
webviews/homeView/dist/index.js
node_modules/@vscode/codicons/dist/codicon.css
node_modules/@vscode/codicons/dist/codicon.csv
node_modules/@vscode/codicons/dist/codicon.html
node_modules/@vscode/codicons/dist/codicon.svg
node_modules/@vscode/codicons/dist/codicon.ttf
node_modules/@vscode/codicons/dist/codiconsLibrary.ts

Type of Change

• • Bug Fix
• • New Feature
• • Breaking Change
• • Documentation
• • Refactor
• • Tooling

User Impact

The bundle for the extension will be smaller.

Directions for Reviewers

Pull down the VSIX file for this PR, install the extension manually, and ensure it behaves normally.