Revert "Run fossa analysis in a distinct pipeline"

[ndeloof]

Reverts #670

Fossa CI build isn't reported to Github as Jenkins github multibranch plugin has commit status context hardcoded : https://github.com/jenkinsci/github-branch-source-plugin/blob/master/src/main/java/org/jenkinsci/plugins/github_branch_source/GitHubNotificationContext.java#L150

Impacted files detection within a PR is someway broken as https://ci.docker.com/teams-dsg/job/dsg/job/app-fossa/view/change-requests/job/PR-655/1/console states Stage "License Scan" skipped due to when conditional while https://github.com/docker/app/pull/655/files do update dependencies and vendoring

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "revert-670-fossa" git@github.com:docker/app.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[codecov]

Codecov Report

Merging #673 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #673      +/-   ##
==========================================
+ Coverage   72.07%   72.19%   +0.11%     
==========================================
  Files          52       52              
  Lines        2636     2636              
==========================================
+ Hits         1900     1903       +3     
+ Misses        492      490       -2     
+ Partials      244      243       -1

Impacted Files	Coverage Δ
types/parameters/parameters.go	96.82% <0%> (+4.76%)	⬆️

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[silvin-lubecki]

LGTM