Resolved a flaky error

[njain2208]

PR Overview:

---

This PR fixes the flaky/non-deterministic behavior of the following test because it assumes the ordering.

org.apache.tika.cli.TikaCLITest#testJsonMetadataOutput

Test Overview:

---

The output returned by getParamOutContent is flaky in nature and is non-deterministic. This results in the testJsonMetadataOutput failing.

This flakiness was identified by the nondex tool created by the researchers of UIUC.

[ERROR]   TikaCLITest.testJsonMetadataOutput:258 expected: <true> but was: <false>

You can reproduce the issue by running the following commands:

mvn install -pl tika-app -am -DskipTests
mvn test -pl tika-app  -Dtest=org.apache.tika.cli.TikaCLITest#testJsonMetadataOutput
mvn -pl tika-app edu.illinois:index-maven-plugin:2.1.1:nondex -Dtest=org.apache.tika.cli.TikaCLITest#testJsonMetadataOutput

Fix:

---

To fix the issue I decided to sort the JSON string. To sort the JSON string I used the Google extension "com.google.code.gson" in the tika-app/pom.xml file. This made the output deterministic and led the code to successfully passing.

https://github.com/njain2208/tika/blob/8fce6e9afcc6872e0d5cdfac08ccd2c7dfd7d0b0/tika-app/src/test/java/org/apache/tika/cli/TikaCLITest.java#L251-L271

[tballison]

Thank you for opening this. As I look at the unit test, I don't think we should test for legacy sort there because, as you point out, there is no guarantee of order from Metadata#names(). I removed that portion of the test in the main branch. Thank you!