Remove redundant code and simplify input parsing during HTTPTrigger creation #2990
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Description
1、Even if the user does not set the flagkey. HtMethod field, there will still be a default value GET, so the following judgment logic is currently redundant. Personally, I think it is more appropriate to replace the return error with a log prompt or delete it.

2、Both createIngress and host are only used for parsing user input and do not perform any other operations. They can be directly parsed during the construction of the HTTPTrigger CR.

3、The parsing of the KeepPrefix field below is redundant

Which issue(s) this PR fixes:
Fixes #
Testing
Checklist: