Sunset the temporary `get` OTTL func in favour of `ValueExpression` support in the OTTL package

[lahsivjar]

Component(s)

connector/signaltometrics

Describe the issue you're reporting

#35621 adds support for data extraction using OTTL value expressions which should replace the stop-gap measure introduced in signaltometrics component for parsing value expressions using a temporary get OTTL function.

[lahsivjar]

/label -needs-triage

[github-actions]

Pinging code owners for connector/signaltometrics: @ChrsMark @lahsivjar. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triaged' to set the priority and remove the needs-triaged label.

[lahsivjar]

/label priority:p2