Change "TaaS" navigation to "Gig Work"

[Oanh-and-only-Oanh]

Change the "Taas" label in the top navigation to say: Gig Work

[sandhiyakavi]

Tested the issue.It is working as expected.

[Jobee1]

Tested in Beta Environment: "Gig Work" is displayed.

[SathyaJayabal]

verified on prod