GAP-2510: Fixing errors caused by setting last updated fields on grant adverts

[GavCookCO]

Description

Fixing errors caused by setting the last updated dates on grant adverts when authenticated as an anonymous user. This occurs when one of our lambdas performs updates on a grant advert.

Ticket # and link
GAP-2510

Summary of the changes and the related issue. List any dependencies that are required for this change:
Added a helper method to check whether an authenticated session is anonymous or not and then called this before saving a grant advert.

Type of change

Please check the relevant options.

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes:

• Unit Test

• Integration Test (if applicable)

• End-to-End Test (if applicable)

Screenshots (if appropriate):

Please attach screenshots of the change if it is a UI change:

Checklist:

• If I have listed dependencies above, I have ensured that they are present in the target branch.
• I have performed a self-review of my code.
• I have commented my code in hard-to-understand areas.
• I have made corresponding changes to the documentation where applicable.
• I have run cypress tests, and they all pass locally.