TMT: simplify podman tests

[lsm5]

dnf download on CentOS Stream ends up downloading all rpm versions of a package from all available repos instead of only the latest rpm. This leads to more (unnecessary) complications in the test script.

Things are a lot simpler if we directly test using the podman-tests package. This means we'll have to disable podman e2e tests and only do system tests but that shouldn't be too big a problem.

A better way to run podman e2e tests would be by creating a podman-src rpm subpackage that'll install all the rpm sources.

Summary by Sourcery

Tests:

• Simplified the podman test script by switching from e2e tests to system tests.

[sourcery-ai]

Reviewer's Guide by Sourcery

Simplified the podman test script by directly using the podman-tests package for system tests and removing the e2e tests. A potential enhancement for e2e tests involves creating a podman-src rpm subpackage.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Removed e2e tests and simplified the test script to use the installed podman-tests package.	Removed the logic for fetching and extracting the latest podman source. Removed the conditional execution of e2e and system tests based on the TEST_TYPE argument. Removed the code that checks for matching versions of podman-tests and podman SRPM. Simplified the script to directly run podman system tests using bats.	test/podman-tests.sh
Removed the usage of the TEST_TYPE argument.	Removed the code that checks for the TEST_TYPE argument and prints usage instructions. Removed the conditional execution of tests based on the TEST_TYPE argument.	test/podman-tests.sh test/main.fmf

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[lsm5]

handled in #345