test: merge separately http3 cases

[bzp2010]

Description

APISIX workflow now tests HTTP3 and other cases separately, which results in more than double the number of workflows, more time-consuming, and more error possibilities.
Given that ngx http3 has been added to the (openresty's) default build since openresty 1.27, and apisix-runtime has long had it as a default build module, I think they can be merged in one place.

This PR aims to remove the separate http3 tests and reduce our mental overhead.

In addition to this, this PR also reduces the time required by a small amount by simply reordering the workflow execution.
Technically, the original workflow started all the required external components at the beginning, such as kafka, etc., which would have consumed some resources and undoubtedly slowed down the subsequent builds of the apisix-runtime, thus slowing down the overall time-consumption. This order has been adjusted to build first, then start the external components.

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[membphis]

LGTM