egrep: warning: egrep is obsolescent

Error `egrep: warning: egrep is obsolescent` in aqa-tests/terminateTestProcesses.sh

```
15:36:52 + aqa-tests/terminateTestProcesses.sh jenkins
15:36:52 Unix type machine..
15:36:52 egrep: warning: egrep is obsolescent; using grep -E
15:36:52 grep: warning: stray \ before /
15:36:52 grep: warning: stray \ before /
15:36:52 Running on a Linux host
15:36:52 egrep: warning: egrep is obsolescent; using grep -E
15:36:52 egrep: warning: egrep is obsolescent; using grep -E
15:36:52 grep: warning: stray \ before /
15:36:52 egrep: warning: egrep is obsolescent; using grep -E
15:36:52 Woohoo - no rogue processes detected!
```

[internal job on rhel10](https://hyc-runtimes-jenkins.swg-devops.com/job/Grinder_JCK/3841/console)

Inspect aqa-tests/terminateTestProcesses.sh, focusing on the egrep and grep commands shown in the RHEL10 Jenkins console output. Run the script or the referenced Grinder_JCK job to confirm the warnings; done means the process-checking behavior remains intact without the obsolescent egrep or stray-backslash warnings.

Written by the indexing model from the issue text.