[TaaS] Restrict the duration field on Jobs to a 4 week minimum

[maxceem]

Task from Will:

I know we have a new intake tool, and once it's ready for primetime I want to retire the Connect form, but in the meantime we need to do a quick update to the Connect intake form.
We need to restrict the duration field on Jobs to a 4 week minimum.

[sandhiyakavi]

Verified on Dev Env

[lakshmiathreya]

cc @coderhacker

[sandhiyakavi]

Verified on Prod Env.