fix(multifence-validation): allow old AND new style id tokens

[vpsx]

There exist people running multi Fence with two modern Fences!

Jira Ticket: n/a

Bug Fixes

• Fix ID token validation for multi-tenant Fence setup: Allow both old and new style ID tokens
• Fix ID token validation for multi-tenant Fence setup: Client Fence should demand its client_id, not its BASE_URL, in the aud claim

[github-actions]

The style in this PR agrees with black. ✔️

This formatting comment was generated automatically by a script in uc-cdis/wool.

[coveralls]

Pull Request Test Coverage Report for Build 11341

• 3 of 5 (60.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 71.008%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
fence/blueprints/login/fence_login.py	3	5	60.0%

Totals
Change from base Build 11333:	-0.01%
Covered Lines:	6199
Relevant Lines:	8730

---

💛 - Coveralls