Add remote webservice deletion notice

[adfoster-r7]

#18439

Verification

When running msfdb init --component webservice or msfdb init --component webservice the user should be prompted:

$ bundle exec ruby ./msfdb init --component webservice
Running the 'init' command for the webservice:
[WARNING] The remote web service is being removed. Does this impact you? React here: https://github.com/rapid7/metasploit-framework/issues/18439
[WARNING] The remote web service is being removed. Does this impact you? React here: https://github.com/rapid7/metasploit-framework/issues/18439
[WARNING] The remote web service is being removed. Does this impact you? React here: https://github.com/rapid7/metasploit-framework/issues/18439
[?] Initial MSF web service account username? [user]: 

[cgranleese-r7]

Looks good to me 👍

msfdb init --component webservice

[smcintyre-r7]

Release Notes

This alerts users that the remote web service will be removed. It prompts them to respond to an issue on GitHub if the removal will affect them.