DeveloperConnect: make fetchLinkableGitRepositories list all linkable git repositories

[mathu97]

Description

Instead of fetching a certain page of linkable git repos, fetchLinkableGitRepositories has been updated to fetch all linkable git repositories, iterating over all pages. This will behave similar to listConnections (renamed to listAllConnections)

Follow up from: https://github.com/firebase/firebase-tools/pull/6887/files/d8841df93bac3c0dbcb8773783db627015842094#r1530608858

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 54.32%. Comparing base (82d3337) to head (50da6e7).

Files	Patch %	Lines
src/gcp/devConnect.ts	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6889      +/-   ##
==========================================
+ Coverage   54.30%   54.32%   +0.02%     
==========================================
  Files         353      353              
  Lines       24578    24583       +5     
  Branches     5086     5086              
==========================================
+ Hits        13346    13355       +9     
+ Misses      10019    10014       -5     
- Partials     1213     1214       +1     

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