NO-JIRA: chore(tests/containers): improve docker socket detection, reducing the need for TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE

[jiridanek]

Description

Volunteers with Linux machines are hereby encouraged to put it to the test. This is to simplify the README.md instructions that Jan is writing down.

How Has This Been Tested?

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[jstourac]

I can confirm that this works on my machine - no need to specify the TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE variable anymore.

/lgtm

[jiridanek]

/approve

[openshift-ci]

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