Omit distribution for setup-java

[twyatt]

With 5.5.0 of setup-java, distribution is no longer needed:

distribution: Java distribution. Required unless java-version-file points to .sdkmanrc with a recognized distribution suffix (for example java=21.0.5-tem).

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Note

Low Risk
CI-only workflow simplification with no application or security logic changes; behavior should match prior Temurin setup as long as .sdkmanrc keeps a recognized distribution suffix.

Overview
Removes the explicit distribution: temurin input from every actions/setup-java@v5 step across CI, Pages, Publish, SensorTag, and signing workflows.

Each step still uses java-version-file: .sdkmanrc, which already pins java=17.0.19-tem; setup-java 5.5.0+ infers Temurin from that suffix, so the extra distribution line is no longer required.

^{Reviewed by Cursor Bugbot for commit 3213921. Configure here.}