VS Code keeps the case. I.e. it  correctly replaces
even getWorkspaceFolders.

The only places where we didn't replace the string were when
we were using the VS Code API (vscode.workspace.workspaceFolders).

If the integration test workspace is missing, fail the test instantly.
This improves contributor experience preventing
unrelated integration test failures.
This commit also moves the documentation for running integration tests
to a more prominent position in the docs.

The testing strategy has been written before we started
writing tests. Now after months of writign tests, lot of the
processes changed.

We migrated to TS and introduced new concepts since the last update.

This is a snippet from a book Effective TypeScript:

WARNING
The examples in this item prefix type names with I or T solely to
indicate how they were defined. You should not do this in your code!
Prefixing interface types with I is common in C#, and this convention
made some inroads in the early days of TypeScript. But it is considered
bad style today because it’s unnecessary, adds little value, and is not
consistently followed in the standard libraries.

This document explains how the current code is structured and it also
hints at what changes are we planning to do to the extension structure
in the near future.

This change introduces Jest test framework to run our unit tests.

Implementing integration and unit tests using mocha and adding two
documents that describe the testing strategy and guide how to write
new tests.

Using conventional-changelog to automatically generate changelog
from conventional commits created since the last tag.

That reflects the automated publishing implemented in !59 and !71