Use Rails.application.credentials instead of deprecated secrets

[jrafanie]

Fixes:
DEPRECATION WARNING: Rails.application.secrets is deprecated in favor of Rails.application.credentials and will be removed in Rails 7.2.

Extracted from #23225

[agrare]

@jrafanie I assume we'll have to do this in all of the providers as well?
E.g.
https://github.com/ManageIQ/manageiq-providers-vmware/blob/b070f714d1bb4d887479b0de120ca6d1d87d2d48/spec/spec_helper.rb#L21

[kbrock]

Yea, I see that Rails.application.secrets is accessed in most providers.
Can we add TODOs for each provider here? (Want me to add the TODOs?

[jrafanie]

@jrafanie I assume we'll have to do this in all of the providers as well?
E.g.
https://github.com/ManageIQ/manageiq-providers-vmware/blob/b070f714d1bb4d887479b0de120ca6d1d87d2d48/spec/spec_helper.rb#L21

Thanks, I did see a warning from one of the plugins in core, it might have been the hmc provider. Yes, I expect we'll have to do this throughout the plugins. At this point, I'm trying to get core to work and then I'll move to the plugins.

Yea, I see that Rails.application.secrets is accessed in most providers. Can we add TODOs for each provider here? (Want me to add the TODOs?

Thanks, I'll add it to the the main issue.

[Fryguy]

It's all over the place in the providers. Additionally, I think it's in the generator as well

[jrafanie]

Thanks, I'll add it to the the main issue.

I added it to #23200

[Fryguy]

@jrafanie I updated the link in #23200 to be broader.