Remove unused HeraldAdapter:buildTokenizerFieldValue()
Summary:
This private function was added in https://we.phorge.it/rP715233fb611569b86f8fd4d8339a7e514c749d69.
Its last use was removed in https://we.phorge.it/rP776caa507b15ef013d3d623d30b294181e2b4c11.
Test Plan: Grep the code; run static code analysis.
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D25785