fix request encoding in generic proxy listener chain and forwarding

[alexrashed]

This PR fixes an issue initially addressed with #6059 (which was later closed in favor of #6065).
Unfortunately, #6065 does not fix the issue described in #6059.
This PR contains the following changes:

• It changes the path and query parameter handling for the handler chain such that the generic proxy uses the url-encoded path and query parameters within its proxy handler chain.
• It partly reverts Minor fixes in edge forwarder and zip utils for dev/host mode #6065, since the proxy listener gets the encoded path and query parts now. /cc @whummer
• Fixes a small issue with the pytest plugin config (moves pytest plugins to the root conftest, since it's not allowed anywhere else anymore).

The special handling with get_full_raw_path was necessary due to a specific peculiarity in Werkzeug's url property handling.
Here's a short scratch to illustrate the issue:

from werkzeug.sansio.utils import get_current_url

# Werkzeug (and with that the Quart request wrapper) internally uses get_current_url on request.url:
# > werkzeug.sansio.Request#L212:
# @cached_property
# def url(self) -> str:
#     """The full request URL with the scheme, host, root path, path,
#     and query string."""
#     return get_current_url(
#         self.scheme, self.host, self.root_path, self.path, self.query_string
#     )

# get_current_url is weird, because it _encodes_ the path segment, while it _decodes_ (some) characters in the query segment
url = get_current_url(scheme="https", root_path="root", path="pa#th", host="host", query_string=b"query-string%2Basdf")
print(url)
assert url == "https://hostroot/pa%23th?query-string+asdf" # <- mind the encoded # (%23) and the decoded %2B (+)!

[thrau]

LGTM! thanks for digging into this.

just a minor comment: maybe we could add a query string to the test case?

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