Deleted browsertests jobs, created Flow jobs

Deleted jobs:

browsertests-qa-en.wikipedia.beta.wmflabs.org-linux-firefox-sauce
browsertests-qa-test2.wikipedia.org-linux-firefox-sauce

Created jobs:

browsertests-Flow-en.wikipedia.beta.wmflabs.org-windows_8-internet_explo
rer-sauce
browsertests-Flow-test2.wikipedia.org-linux-chrome-sauce
browsertests-Flow-test2.wikipedia.org-linux-firefox-sauce
browsertests-Flow-test2.wikipedia.org-windows_8-internet_explorer-sauce

Paired with: Chris McMahon

Bug: 58040
Change-Id: I29e8069678c43e44a2b3f744238257911ce4692c