Support multi company setup External SharePoint account

[mgosselink4ps]

What & why

Creating a SharePoint file account is currently per company. Most of our customers use one SharePoint account per database. Most databases contain 30 companies or more. Manually creating these file accounts per company is a burden. This PR will fix that.

Linked work

Fixes #

How I validated this

• I read the full diff and it contains only changes I intended.
• I built the affected app(s) locally with no new analyzer warnings.
• I ran the change in Business Central and confirmed it behaves as expected.
• I added or updated tests for the new behavior, or explained below why none are needed.

What I tested and the outcome (required — be specific: scenarios, commands, screenshots for UI changes)
In the "Ext. SharePoint Account Wizard"-page enabled "Multiple Companies" and thereby created file account in multiple companies.
Tested this with and without the "Company Filter" and with and without "Set as default" set.

Risk & compatibility

Due to the protection level the permission check if a user has rights to set the newly created file account is default is done with calling "File Account Impl.".IsUserFileAdmin().

When multi company is activated, an exiting SharePoint file account will be removed before it will be added again.

[github-actions]

Could not find linked issues in the pull request description. Please make sure the pull request description contains a line that contains 'Fixes #' followed by the issue number being fixed. Use that pattern for every issue you want to link.

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