Fix tag error for workflow segments files

[GarethCabournDavies]

There is an error if you try to use a segment file directly, caused as this call expects a single tag rather than a list

Standard information about the request

This is a: bug fix

This change affects: the offline search

This change: follows style guidelines (See e.g. PEP8)

Motivation

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• The author of this pull request confirms they will adhere to the code of conduct

[Copilot]

Pull request overview

Fixes an offline-search workflow bug when a segments source is configured as a direct file, by using the correct tag-aware config accessor for a list of tags.

Changes:

• Replace cp.get_opt_tag(...) (single-tag API) with cp.get_opt_tags(...) (multi-tag API) when resolving a *-file option under workflow-segments.

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