Relative excludes to allow overriding excludes

[HPiirainen]

With these changes, we can include some directories in the project phpcs.xml, f. ex. <file>web/app/plugins/foo</file> to lint custom plugins.

[github-actions]

Composer package changes

Prod Packages	Operation	Base	Target
automattic/vipwpcs	Upgraded	2.3.3	2.3.4
composer/installers	Upgraded	v2.2.0	v2.3.0
dealerdirect/phpcodesniffer-composer-installer	Upgraded	v0.7.2	v1.0.0
sirbrillig/phpcs-variable-analysis	Upgraded	v2.11.10	v2.11.18
squizlabs/php_codesniffer	Upgraded	3.7.1	3.10.1

Dev Packages	Operation	Base	Target
clue/stream-filter	Upgraded	v1.6.0	v1.7.0
ergebnis/composer-normalize	Upgraded	2.29.0	2.43.0
ergebnis/json	New	-	1.2.0
ergebnis/json-normalizer	Upgraded	2.1.0	4.5.0
ergebnis/json-pointer	New	-	3.4.0
ergebnis/json-printer	Upgraded	3.3.0	3.5.0
ergebnis/json-schema-validator	Upgraded	2.0.0	4.2.0
guzzlehttp/guzzle	Upgraded	7.5.0	7.8.1
guzzlehttp/promises	Upgraded	1.5.2	2.0.2
guzzlehttp/psr7	Upgraded	2.4.3	2.6.2
justinrainbow/json-schema	Upgraded	5.2.12	v5.2.13
knplabs/github-api	Upgraded	v3.9.0	v3.14.1
laminas/laminas-diactoros	Upgraded	2.24.0	2.26.0
m4tthumphrey/php-gitlab-api	Upgraded	11.8.0	11.14.0
php-http/cache-plugin	Upgraded	1.7.5	2.0.0
php-http/client-common	Upgraded	2.6.0	2.7.1
php-http/discovery	Upgraded	1.14.3	1.19.4
php-http/httplug	Upgraded	2.3.0	2.4.0
php-http/message	Upgraded	1.13.0	1.16.1
php-http/multipart-stream-builder	Upgraded	1.2.0	1.3.1
php-http/promise	Upgraded	1.1.0	1.3.1
psr/http-client	Upgraded	1.0.1	1.0.3
psr/http-factory	Upgraded	1.0.1	1.1.0
psr/http-message	Upgraded	1.0.1	1.1
roave/security-advisories	Changed	dev-latest 7868bed	dev-latest 59b0da5
symfony/console	Upgraded	v6.2.3	v6.4.8
symfony/deprecation-contracts	Upgraded	v3.2.0	v3.5.0
symfony/options-resolver	Upgraded	v6.2.0	v7.1.1
symfony/polyfill-ctype	Upgraded	v1.27.0	v1.30.0
symfony/polyfill-intl-grapheme	Upgraded	v1.27.0	v1.30.0
symfony/polyfill-intl-normalizer	Upgraded	v1.27.0	v1.30.0
symfony/polyfill-mbstring	Upgraded	v1.27.0	v1.30.0
symfony/polyfill-php80	Upgraded	v1.27.0	v1.30.0
symfony/service-contracts	Upgraded	v3.2.0	v3.5.0
symfony/string	Upgraded	v6.2.2	v7.1.1
php-http/message-factory	Removed	v1.0.2	-

[Liblastic]

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