No privacy provider in step_pushbackuptask subplugin causes unit test failure

[djarran]

Description: Running the following unit test results in an error because the subplugin does not have a privacy provider

> vendor/bin/phpunit --filter test_all_providers_compliant privacy/tests/privacy/provider_test.php
Moodle 4.5.11+ (Build: 20260501), 11cb1f29138b7bf3a451cad5cc1edc4b1ef85693
Php: 8.3.27, pgsql: 17.10 (Debian 17.10-1.pgdg13+1), OS: Linux 6.17.0-35-generic x86_64
PHPUnit 9.6.34 by Sebastian Bergmann and contributors.

...............................................................  63 / 632 (  9%)
............................................................... 126 / 632 ( 19%)
............................................................... 189 / 632 ( 29%)
............................................................... 252 / 632 ( 39%)
............................................................... 315 / 632 ( 49%)
............................................................... 378 / 632 ( 59%)
............................................................... 441 / 632 ( 69%)
............................................................... 504 / 632 ( 79%)
...............F............................................... 567 / 632 ( 89%)
............................................................... 630 / 632 ( 99%)
..                                                              632 / 632 (100%)

Time: 01:12.524, Memory: 98.50 MB

There was 1 failure:

1) core_privacy\privacy\provider_test::test_all_providers_compliant with data set "lifecyclestep_pushbackuptask" ('lifecyclestep_pushbackuptask', 'lifecyclestep_pushbackuptask\...ovider')
Failed asserting that false is true.

/var/www/mdl45-unicat/privacy/tests/privacy/provider_test.php:179
/var/www/mdl45-unicat/lib/phpunit/classes/advanced_testcase.php:76

FAILURES!
Tests: 632, Assertions: 632, Failures: 1.