Rename testDependency to externalDependency

[llxia]

We use the testDependency folder to pre-stage third-party libraries on the machine, ensuring there are no network issues during runtime. Additionally, a cleanup job runs twice a day to remove any leftover test materials from the machines. To improve automatic cleaning of test materials while preserving the advantage of preloading test dependencies, we will rename the testDependency folder to externalDependency.

Related: eclipse-openj9/openj9#19791

[IamLRBA]

Hello @llxia , I'd like to contribute by handling this issue please.
May it be assigned to me.
Thanks!
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[llxia]

Thanks, @IamLRBA. However, this may need coordination and testing for all sites, so it may not be an ideal first issue. Please feel free to choose from https://github.com/adoptium/aqa-tests/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[IamLRBA]

Thanks, @IamLRBA. However, this may need coordination and testing for all sites, so it may not be an ideal first issue. Please feel free to choose from https://github.com/adoptium/aqa-tests/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

Alright, let me look through