dev/core#5640 explicitly disable mod_negotiation MultiViews in default Standalone apache config

[ufundo]

Overview

mod_negotiation MultiViews seems liable to cause problems if it is enabled. Let's explicitly disable it.

Before

• most people MultiViews is disabled by default
• if your webhost has it enabled for some reason, you can't log in to your standalone site https://lab.civicrm.org/dev/core/-/issues/5640
• it may also cause problems with FormBuilder ? https://lab.civicrm.org/dev/core/-/issues/5640#note_175349

After

• if mod_negotiation is enabled, MultiViews is explicitly disabled

Technical Details

I'm not sure if there are any times this could cause problems. Maybe if a host's apache config forces you to enable this option it will crash - but it is probably better to crash earlier than go through the install process to get a seemingly working site, then be unable to log in.

I found that this the default Laravel .htaccess has similar: https://github.com/laravel/laravel/blob/658a49a19e98a6059a543be7564d39dc2e6970e0/public/.htaccess#L3 ( Here Options -Indexes is also inside the IfModule conditional ? Maybe we should do that too? )

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The issue associated with the Pull Request can be viewed at https://lab.civicrm.org/dev/core/-/issues/5640