Use API methods instead of form submissions in FilterFormatAccessTest::setUp()

Self explanatory. Pretty sure this is a very old test from the early days of simpletest.

Changes looks good: used FilterFormat() API instead of hit the page & update using form submission, verify test changes on local, its output on the basis of time & memory usage as follow:

Before applied MR changes test takes : Time: 00:21.007, Memory: 6.00 MB

After applied MR changes test takes: Time: 00:18.433, Memory: 6.00 MB

observed test resources usage improved & attached screenshot as well, moving to RTBC

nod_ → closed merge request !8905

Committed and pushed 1b3ff65f1c to 11.x and d75b4e27a3 to 11.0.x and c75bd9ded4 to 10.4.x and 7b65c9f7b6 to 10.3.x. Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.