Vendor a-s into gecko

[bendk]

Get application-services vendored in gecko because:

• This paves the way for us to use glean in a-s.
• It also opens the door to “cherry-picking” versions of particular components
• Improves performance, although this is probably not significant at this point.

┆Issue is synchronized with this Jira Task ┆Sprint End Date: 2021-09-30