Add  opacity decoration option

Adds a new opacity option for text decorations. This controls the opacity of the text (it does not effect the border or background added by the decoration since those already have alpha channels)

Fixes #43004

Fixes #47528

These diagnostics should only ever be downgraded from errors to warnings, not ever upgraded from a lower level to warnings

Fixes #47527

Pulls in new header scopes for #47113

Fixes #47512

Pulls in:

- Don't mutate options
- A null check when writing data
- Color refactor

Fixes #47489

* first cut automated symbols management from builds

* fix variables access

* fix windows hockeyAppId

* use codeVersion

* restore tests