Serialiser_Engine: Various changes to get unit-tests functional

[peterjamesnugent]

Issues addressed by this PR

Closes #3390
Closes #3392

Test files

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Changelog

• Removed test in Serialiser_Engine that contained Hashset<int> in the CustomData causing it to fail.
• Added ExplictType for Hashset<T> to avoid failing UnitTest;
• Removed null inputs from URL unit test that was causing a null execption;
• Updated URL, IsPrototype and DocumentationURL unit-tests;
• Removed tests for AllTypesIObject() and Versinoing from Serialiser_Engine_Tests because the [Ignore] attribute is not working as inteded for CI;
• Removed serialiser test for BitMap as test is not functioning as intended for CI.

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[alelom]

Re-approving following adjustment to my comment here:
#3391 (review)

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