[BUG] [Test Proxy] Cannot run tests in playback mode for the first time for more than one client simultaneoously

[vcolin7]

Describe the bug
The first time I try to run tests in playback mode for a library that has had its test recordings migrated to the new assets repo, only one client out of two I have will succeed in running said tests and the other will fail with the following message:

Exception or Stack Trace

java.lang.RuntimeException: Could not save test proxy download
	at com.azure.core.test.utils.TestProxyDownloader.downloadProxy(TestProxyDownloader.java:138)
	at com.azure.core.test.utils.TestProxyDownloader.installTestProxy(TestProxyDownloader.java:56)
	at com.azure.core.test.utils.TestProxyManager.<init>(TestProxyManager.java:37)
	at com.azure.core.test.TestProxyTestBase.setupTestProxy(TestProxyTestBase.java:45)
	... 36 more
Caused by: java.nio.file.FileAlreadyExistsException: C:\Users\<My-Username>\AppData\Local\Temp\testproxy.zip
	at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:87)
	at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
	at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
	at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:236)
	at java.base/java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:484)
	at java.base/java.nio.file.Files.newOutputStream(Files.java:228)
	at java.base/java.nio.file.Files.copy(Files.java:3161)
	at com.azure.core.test.utils.TestProxyDownloader.downloadProxy(TestProxyDownloader.java:134)
	... 39 more

To Reproduce
Delete your local .assets folder and try to run the Maps Geolocation package's tests in playback mode from the sdk/maps/azure-maps-geolocation/src/test/java path.

Code Snippet
N/A

Expected behavior
You should be able to run all tests at once even if assets have not been downloaded beforehand.

Screenshots
N/A

Setup (please complete the following information):

• OS: Windows 11
• IDE: IntelliJ
• Library/Libraries: com.azure:azure-core-test:1.18.0
• Java version: 11
• App Server/Environment: N/A
• Frameworks: N/A

If you suspect a dependency version mismatch (e.g. you see NoClassDefFoundError, NoSuchMethodError or similar), please check out Troubleshoot dependency version conflict article first. If it doesn't provide solution for the problem, please provide:

• verbose dependency tree (mvn dependency:tree -Dverbose)
• exception message, full stack trace, and any available logs

Additional context
N/A

Information Checklist
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• Bug Description Added
• Repro Steps Added
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[samvaity]

To Reproduce
Delete your local .assets folder and try to run the Maps Geolocation package's tests in playback mode from the sdk/maps/azure-maps-geolocation/src/test/java path.

Is the package i.e maps already migrated to assets repo at this point when you attempt to do this?

[billwert]

This shouldn't be related to .assets as it is trying to save the file in question to the temp folder. I think if we synchronize TestProxyDownloader.installTestProxy() it will fix this problem.

[vcolin7]

It happens for both packages with assets in the repo and those that haven't gone through the process but use TestProxyTestBase, I think it's related to installing the Test Proxy itself on the host machine.