releng: build with e4.40 by default and enable automatic updates for 12.0.0

[arfio]

What it does

• releng: build with tracecompass-e4.40 target by default
• tmf.ui.swtbot.tests: Modify button name to make the test work
• releng: enable automatic updates in the RCP for 12.0 release

How to test

Build Trace Compass

Follow-ups

N/A

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the instructions in this template

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: abf21ec5-94cc-46c4-951c-cede71d3548b

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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