fix: validate_function_params error message

[Kisbogyi]

Description

Fixes #
function argument error message

When somebody created a trigger with wrong parameters the error said: "FunctionLoadError: cannot load the healthcheck function: the following parameters are declared in function.json but not in Python: {'myTimer'}" but with python function v2 functin.json is not utilized.

Examle code snippet to reproduce issue:

@bp_healthcheck.timer_trigger(
    schedule="0 */30 * * * *", arg_name="myTimer"
)
async def healthcheck() -> None:

Solution is that I rewrote the wording of the exception.

There is this comment in the call stack so I think validate_function_params should not be called when v1 function is loaded. (azure_functions_worker/dispatcher.py line 457)

# For V1, the function path will not exist and
# return None.

Moreover it has an annotations parameter, which is v2 only. So this should not be a problem.

Tests were updated!

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