Test: Optional branch picking in the Git repository picker API

[joaomoreno]

Refs: #106664

• anyOS @RMacfarlane
• anyOS @gregvanl

Complexity: 3

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The git.api.getRemoteSources command now accepts a branch: boolean field which, when true, prompts the user to pick a branch. Please follow the spec and example below, in order to create a sample extension which uses this Git/GitHub API:

#106664 (comment)

You basically only need to write the following code:

await commands.executeCommand('git.api.getRemoteSources', {
	providerLabel: (provider: RemoteSourceProvider) => `Testing the branch picker of ${provider.name}`,
	urlLabel: `URL`,
	branch: true
});

Once that code executes, a repo picker should appear. Pick GitHub. Then a branch picker should appear. The first option should be the repo's default branch (often master).