Add XRegExp polyfill to text.test.js #15544

Job	Run time
test-sqlite-elasticsearch5 (3.8, Django>=3.2,<3.3)	6m 28s
test-postgres-elasticsearch6 (3.8, Django>=3.2,<3.3)	6m 38s
test-mysql (3.9, Django>=4.2,<4.3, false)	17m 31s
test-postgres (3.8, Django>=3.2,<3.3, false, --parallel)	8m 32s
test-postgres-elasticsearch7 (3.10, Django>=5.0,<5.1, false)	8m 10s
test-mysql (3.11, Django>=5.0,<5.1, false, --parallel, mysql:8.1)	10m 26s
test-postgres (3.11, Django>=5.0,<5.1, false, emailuser, --parallel)	7m 23s
test-sqlite (3.10, Django>=4.1,<5.0)	10m 30s
test-postgres (3.12, Django>=4.2,<4.3, postgres:15, notz, false, --parallel)	9m 3s
test-sqlite-elasticsearch8 (3.10, Django>=4.2,<4.3, emailuser)	6m 27s
test-sqlite-opensearch2 (3.11, Django>=5.0,<5.1, false)	5m 37s
test-postgres (3.10, git+https://github.com/django/django.git@stable/5.0.x#egg=Django, true)	15m 2s
test-postgres (3.10, git+https://github.com/django/django.git@main#egg=Django, true, postgres:lat...	7m 57s
coverage	1m 0s
	2h 0m 44s

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