Test and enable transformer_building_blocks in the build

[svekars]

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As a follow up on this: #3075

Describe the bug

As a follow up on this:
#3075, when RC 2.6 is available, we need a PR that:

• Enables the tutorial in the build - need to test against the test RC-2.6 branch but merge to main (when 2.6 is available in main).
• Remove the note about the tutorial that it requires a nightly build.

Describe your environment

n/a

cc @williamwen42 @msaroufim @anijain2305