Remove warning about nuget-feed not supporting replaces-base

[JamieMagee]

Why:

This was resolved back in April dependabot/dependabot-core#12105

What's being changed (if available, include any code snippets, screenshots, or gifs):

This removes the dependabot-replaces-base-nuget.md reusable snippet and any uses of it.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Table of review links

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Source	Review	Production	What Changed
code-security/dependabot/working-with-dependabot/configuring-access-to-private-registries-for-dependabot.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
code-security/dependabot/working-with-dependabot/dependabot-options-reference.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Copilot]

Pull Request Overview

This PR removes outdated warning documentation about the nuget-feed not supporting the replaces-base parameter, as this limitation was resolved in April with dependabot-core pull request #12105.

Key changes:

• Removes the reusable warning content file that contained the outdated note
• Removes all references to this warning from Dependabot configuration documentation

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
data/reusables/dependabot/dependabot-replaces-base-nuget.md	Deletes the entire reusable content file containing the outdated warning
content/code-security/dependabot/working-with-dependabot/dependabot-options-reference.md	Removes two references to the outdated warning about nuget-feed limitations
content/code-security/dependabot/working-with-dependabot/configuring-access-to-private-registries-for-dependabot.md	Removes reference to the outdated warning in the private registries configuration guide

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