Build tags set during the build execution disappear after the build finishes

[tolache]

Steps

1. Install TestingBot 1.0 on TeamCity 2023.05.1.
2. Add a command line step with the following command to a build: echo "##teamcity[addBuildTag 'SomeTag']".
3. Run the build.

Expected

The tag "SomeTag" is added to the build during the execution and is kept after the build is finished.

Actual

The tag is added when the build is running, but is removed after the build is finished.

[aldpuzz]

it's likely this line:

testingbot-teamcity-plugin/testingbot-teamcity-server/src/main/java/com/testingbot/teamcity/plugin/TestingBotServerAdapter.java

Line 55 in c05267a

build.setTags(sessionIds);

It should merge the two sets instead of replacing it