Improve support of property repeat-continue-only in repeat-mode (bug#74140)

Improve support of property repeat-continue-only in repeat-mode (bug#74140)

* lisp/repeat.el (repeat-get-map): Add optional arg 'rep-map'.
Move the check for 'repeat-continue-only' from 'repeat-pre-hook'.
Improve its logic to check if the current map 'repeat-in-progress'
exists in the list from the 'repeat-continue-only' property.
(repeat-post-hook): Set 'repeat-in-progress' to the symbol
from the property 'repeat-map'.

* test/lisp/repeat-tests.el (repeat-tests-another-repeat-map):
Add new keymap to test multiple parallel repeat-maps.
(repeat-tests-continue-another): New test that uses commands
from 'repeat-tests-another-repeat-map' shared with
'repeat-tests-repeat-map'.

(cherry picked from commit 9232c985ef3d874755b0cbf4399fcc7077c308b5)