[3.12] gh-108851: Fix tomllib recursion tests (GH-108853) (#109012)

gh-108851: Fix tomllib recursion tests (GH-108853)

* Add get_recursion_available() and get_recursion_depth() functions
  to the test.support module.
* Change infinite_recursion() default max_depth from 75 to 100.
* Fix test_tomllib recursion tests for WASI buildbots: reduce the
  recursion limit and compute the maximum nested array/dict depending
  on the current available recursion limit.
* test.pythoninfo logs sys.getrecursionlimit().
* Enhance test_sys tests on sys.getrecursionlimit()
  and sys.setrecursionlimit().
(cherry picked from commit 8ff11425783806f8cb78e99f667546b1f7f3428e)

Co-authored-by: Victor Stinner <vstinner@python.org>