[Quality Management] [28.x] Improvements in "Value Type Text Expression" and tooltips

[JakovljevicDusan]

What & why

Fixes:

1. Expression Formula not copied to template, not visible on template subform, Default Value not guarded for Text Expression tests
2. Text Expression test value is editable - manual overrides silently lost on re-evaluation
3. Single-line text expression inspection never evaluates the expression

Improvements:

1. Quality Inspection document teaching tips
2. Setup guide text

Linked work

Fixes AB#638192
Fixes AB#638193
Fixes AB#638194