Enhance permission denied exception logs

[pawelpasterz]

Fixes #874

Test Plan

How do we know the code works?

1. User don't have permission to project (403)

When user don't have permission to project Flank should returns message like:

Flank encountered a 403 error when running on project $project_name. Please verify this credential is authorized for the project.
Consider authentication with a Service Account https://github.com/Flank/flank#authenticate-with-a-service-account
or with a Google account https://github.com/Flank/flank#authenticate-with-a-google-account

Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 Forbidden
{
  "code" : 403,
  "errors" : [ {
    "domain" : "global",
    "message" : "The caller does not have permission",
    "reason" : "forbidden"
  } ],
  "message" : "The caller does not have permission",
  "status" : "PERMISSION_DENIED"
}

2. Project not found (404)

When project not found on firebase Flank should return message like:

Flank was unable to find project $project_name. Please verify the project id.

Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 404 Not Found
{
  "code" : 404,
  "errors" : [ {
    "domain" : "global",
    "message" : "Project not found: $project_name",
    "reason" : "notFound"
  } ],
  "message" : "Project not found: $project_name",
  "status" : "NOT_FOUND"
}

3. On this two cases Flank throws FlankCommonException and exit with code: 1

Checklist

• Documented
• Unit tested
• release_notes.md updated

[codecov-commenter]

Codecov Report

Merging #875 into master will decrease coverage by 0.03%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master     #875      +/-   ##
============================================
- Coverage     82.75%   82.72%   -0.04%     
  Complexity      638      638              
============================================
  Files           172      172              
  Lines          3370     3386      +16     
  Branches        481      483       +2     
============================================
+ Hits           2789     2801      +12     
- Misses          311      316       +5     
+ Partials        270      269       -1     

[bootstraponline]

The pull request looks great! I left some small comments about updating the wording.