treewide: pytestFlagsArray -> pytestFlags and join flag and option argument

This treewide change targets Python packages
that specifies pytest flags with pytestFlagsArray,
and whose flags cannot be consructed by other pytestCheckHook-honoured arguments.

Use the __structuredAttrs-agnostic argument pytestFlags
instead of the deprecated pytestFlagsArray.

For flags with option arguments,
join each flag and their option argument into a single command-line argument
following POSIX Utility Argument Syntax[1]
for easier overriding (remove/replace).

Examples:

* [ "-W" "ignore:message:WarningClass" ] ->
  [ "-Wignore:message:WarningClass" ]

* [ "--reruns" "3" ] ->
  [ "--reruns=3" ]

[1]: https://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap12.html

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