[JENKINS-31924] GitSCMSource should offer extensions

GitSCM.extensions such as CleanBeforeCheckout cannot currently be configured on GitSCMSource.

is blocking

JENKINS-37658 Github-branch-source plugin should support git plugin extensions

JENKINS-32552 Multibranch project git branch checkout

JENKINS-34752 Changes screens don't provide links to GitHub Enterprise screens

is duplicated by

JENKINS-33022 Allow Git shallow clone in Multibranch pipeline

JENKINS-32540 Multibranch workflow and 'scm checkout' don't allow Git clean before checkout

JENKINS-32658 Multibranch pipeline 'checkout scm' does not handle Git submodules

is related to

JENKINS-37817 checkout scm should be able to override extensions/settings

JENKINS-32767 GitSCMSource can hang in branch indexing, blocking builds

relates to

JENKINS-36419 git plugin 2.5.1 breaks multibranch pipeline if using github source control

links to

PR 350

(1 is duplicated by, 2 is related to, 1 relates to, 1 links to)

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