fix: Avoid unnecessary field resets in the API Request component

[thiau]

This PR fixes some issues related to field reset in the API Request components:

• Fixes APIRequestComponent reset field when entering the flow #7382 by adding a condition to ensure the use_curl property is active before proceeding with the field reset.
• Remove the else clause from _update_method_fields to avoid unnecessarily resetting fields to advanced.
• Update the else clause from _update_curl_mode to only set a field as advanced when use_curl is set.

Test Evidence 1

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After ⬇️

Test Evidence 2

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After ⬇️