feat(ado-improvements-1): Add group around installing dependencies

[DaveTryon]

Details

As requested in #950, this adds a group tag for the ADO extension around the process of installing runtime dependencies.

Output before this change:

installing runtime dependencies...
[1/4] 🔍  Resolving packages...
// Warnings omitted for brevity
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 🔨  Building fresh packages...

Output after this change:

##[group]Installing runtime dependencies
[1/4] 🔍  Resolving packages...
// Warnings omitted for brevity
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 🔨  Building fresh packages...
##[endgroup]

Motivation

Improve logging as requested in #950

Context

This changes only the ADO experience. The Action experience already has this broken out as a separate step, so it's already broken out there.

Pull request checklist

• Addresses an existing issue: Progress on Task log output is too verbose, difficult to read #950
• [n/a] Added relevant unit test for your changes. (yarn test)
• [n/a] Verified code coverage for the changes made. Check coverage report at: <rootDir>/test-results/unit/coverage
• Ran precheckin (yarn precheckin)