ci: change backport config and update pre-commit config

[MyuddinKhatri]

change backport config - https://github.com/tibdex/backport
Labels to be added - backport version-15 and backport version-14

Added pre-commit codespell
Updated pre-commit config for test utils

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
__init__.py	11	5	54%	10–11, 17–19
customize.py	25	25	0%	1–2, 4, 7–9, 12–19, 24–32, 44–45
hooks.py	15	0	100%
cloud_storage
__init__.py	0	0	100%
cloud_storage/doctype
__init__.py	0	0	100%
cloud_storage/doctype/file_association
__init__.py	0	0	100%
file_association.py	3	0	100%
cloud_storage/doctype/file_version
__init__.py	0	0	100%
file_version.py	3	3	0%	5, 8–9
cloud_storage/overrides
file.py	337	150	55%	45, 52, 80, 85, 92, 101, 107, 139, 142, 152–159, 161–169, 173, 178–179, 183–185, 187–192, 195–197, 199–200, 202, 204, 213, 216–217, 219, 222, 225, 230–231, 234, 237, 248–252, 257, 266, 268–269, 271, 276–280, 283–285, 319, 325, 331, 337, 343, 349, 359, 361–363, 367, 375–377, 379, 393–394, 396, 419–423, 431–432, 435–436, 457–458, 465–466, 481–482, 485, 488–497, 504–505, 507–509, 512–513, 518–520, 522, 527–530, 535, 537, 549–550, 552, 557–561, 563, 568–574
config
__init__.py	0	0	100%
desktop.py	3	3	0%	1, 4–5
docs.py	6	6	0%	1, 3–5, 9–10
tests
conftest.py	26	1	96%	36
test_file.py	90	0	100%
TOTAL	519	193	62%