HDDS-15347. Move virtual-host test out of smoketest/s3

[adoroszlai]

What changes were proposed in this pull request?

smoketest/s3/awss3virtualhost.robot requires special configuration (ozone.s3g.domain.name), so it does not work with most acceptance test environments. When running all tests in smoketest/s3, this test currently needs to be excluded, e.g.:

ozone/hadoop-ozone/dist/src/main/compose/ozone-ha/test.sh

Lines 40 to 41 in c13a0c0

	## Exclude virtual-host tests. This is tested separately as it requires additional config.
	exclude="--exclude virtual-host"

We can avoid the need for exclusion by moving it to another directory.

https://issues.apache.org/jira/browse/HDDS-15347

How was this patch tested?

s3-virtual-host :: S3 gateway test with aws cli using virtual host style ad...
==============================================================================
File upload and directory list with virtual style addressing          | PASS |
------------------------------------------------------------------------------
s3-virtual-host :: S3 gateway test with aws cli using virtual host... | PASS |
1 test, 1 passed, 0 failed

https://github.com/adoroszlai/ozone/actions/runs/26282681788/job/77364249255#step:13:1357

CI:
https://github.com/adoroszlai/ozone/actions/runs/26282681788