Rendering of the "Re-Transcribe" button should independent of the "Generate transcripts from audio files" setting

[Sidsector9]

Is your enhancement related to a problem? Please describe.

When Generate transcripts from audio files is disabled, the "Re-Transcribe" button in the Media library page is not rendered, however, we can still use CLI to Re-Transcribe. The setting description says
"Automatically generate transcripts for supported audio files", but Re-Transcribing is a manual process. So IMO we should render that button at all times, whether this setting is enabled or disabled.

Describe alternatives you've considered

We should add a separate setting to enable/disable the feature, and use this setting value as a conditional to decide whether to render the button in the GUI.

Related: PR #451, PR #514

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[jeffpaul]

@Sidsector9 I think the current handling seems correct in the admin, though some might also say that the CLI should also be disabled if the main setting is disabled but I'm less worried about that than in-admin handling.

[jeffpaul]

Perhaps alternatively where we have the ability to handle Bulk updating with the Bulk Edit and where we have the ability to use this feature via WP-CLI maybe each should be a setting to configure (with the default being enabled if the feature is enabled during initial setup)? If so, then we'd likely want to replicate that across features/service providers.