test: enable JIT again for flaky tests on arm64

JIT has been disabled for these 4 tests on arm64 to avoid failing due to
side-effects of constant rematerialization:
* <app-tap/datetime.test.lua>
* <box-luatest/gh_6539_log_user_space_empty_or_nil_select_test.lua>
* <box-luatest/pagination_netbox_test.lua>
* <engine-luatest/pagination_test.lua>

The problem was solved via the commit
15e62a67 ("luajit: bump new version").
So, enable JIT compilation for these tests back.

Closes #6599
Closes #7739
Closes #8011

NO_CHANGELOG=tests
NO_DOC=tests