RDISCROWD-5775 limit task expiration

[n00rsy]

Issue number of the reported bug or feature request: RDISCROWD-5775

Describe your changes
Modifies the task API so that task expiration cannot be set beyond the permitted max expiration (60 days for private and 180 days for public) using a PUT request.
If the user tries to set task expiration beyond the limit, it is set to the maximum possible expiration and the method returns a 200 response code.

Testing performed
Tested Locally

[coveralls]

Pull Request Test Coverage Report for Build 4473521466

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.0007%) to 94.071%

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Totals
Change from base Build 4439432491:	0.0007%
Covered Lines:	16738
Relevant Lines:	17793

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💛 - Coveralls

[ciaracian]

Looks good to me - thanks Noor!