Stop using Internet#username() interally

[kingthorin]

Since Internet#usernam() was already changed to use Credentials#username() all internal use may as well do the same thing so that DF itself isn't using deprecated methods.

[what-the-diff]

PR Summary

• Alteration in email address generation in Internet.java
  The way email addresses are generated in Internet.java has been updated. Now, it uses credential-specific usernames, ensuring more security and accuracy.

• Update in safeEmailAddress() method in Internet.java
  The safeEmailAddress() method, which was previously using the basic username() method, has been revamped. Now it also uses credential-specific usernames, enhancing the safety of email addresses that the method generates.

• Changes to username() in Name.java
  The username() method in Name.java was modified to return a credential-specific username, replacing the previous internet-based method. This change ensures the generation of more secure and specific usernames.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.28%. Comparing base (93ebb4f) to head (6da85ad).
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Additional details and impacted files

@@ Coverage Diff @@ ## main #1671 +/- ## ========================================= Coverage 92.28% 92.28% Complexity 3393 3393 ========================================= Files 333 333 Lines 6714 6714 Branches 666 666 ========================================= Hits 6196 6196 Misses 354 354 Partials 164 164 

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[kingthorin]

Thanks @asolntsev !