Fix notices on Multisite settings form

[eileenmcnaughton]

Overview

Fix notices (unreleased version) on multisite settings form.

Before

e-notices

After

Technical Details

Includes #13023 & I will rebase when merged - that PR also gives more back ground.

the key thing to note here is that it proposes new things in the setting spec for html rendering

For the 'learn more' url is rendered by this in the html

    'help_link' => [
      'page' => 'Multi Site Installation',
      'resource' => 'wiki',
    ],

I also added

'entity_reference_options' => ['entity' => 'group', 'select' => array('minimumInputLength' => 0)],

Which holds the options for the entity reference field. I didn't want to use 'options' as we pretty consistently use that as an array of option values

Comments

@mattwire @seamuslee001 @colemanw

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[seamuslee001]

I have tested this and confirmed it fixes the e-notices and confirmed the settings are still correct.

[eileenmcnaughton]

thanks @seamuslee001 this actually incorporates #13023 & #13022 which is the mailing components form & contribute components - did you test that too?

Also - I think it's good to get this merged ASAP as it could save people time reporting these temporary regressions -but I'm opening to tweaking the metatdata conventions introduced in this PR afterwards (& before I document them)

[seamuslee001]

I tested the mailing components page yes

[seamuslee001]

merging as per my review and the tag