Merge branch 'fixes-status-in-scan-progress' into 'master'

Fixes status_message in scan progress

Closes #4431 (closed)

See merge request !6504 (merged) and !6521 (merged)

(cherry picked commits de5d9877 and c07302ed)

• 0e8926ba textblock: Create greenlet tag textblock_context_greenlet to allow to use textblock
• 9720cd2b scan: Use textblock_context_greenlet tag and add some greenlet name
• 65f840d9 Added changelog
• c07302ed Do not store greenlets but id

Co-authored-by: Lucas Felix lucas.felix@esrf.fr