[Deprecation] Legacy `Puppet::Network` HTTP APIs

[silug]

Summary

Multiple legacy HTTP APIs are marked deprecated in favor of Puppet.runtime[:http] and modern HTTP client paths.

Evidence

• lib/puppet/network/http_pool.rb:10 deprecates module in favor of Puppet::HTTP::Client.
• lib/puppet/network/http_pool.rb:31 and lib/puppet/network/http_pool.rb:55 deprecate http_instance and connection.
• lib/puppet/network/http_pool.rb:35 and lib/puppet/network/http_pool.rb:59 emit runtime deprecation warnings.
• lib/puppet/network/http/connection.rb:18 marks class deprecated in favor of Puppet.runtime[:http].
• lib/puppet/network/http/handler.rb:43 marks format_to_mime deprecated.

Proposed OpenVox 9 Change

• Remove Puppet::Network::HttpPool API surface.
• Remove deprecated Puppet::Network::HTTP::Connection compatibility class.
• Remove deprecated format_to_mime helper from HTTP handler.

Compatibility / Risk

• High plugin ecosystem risk if external code depends on legacy classes.
• Core can migrate with controlled internal refactors.

Implementation Notes

• Inventory internal call sites before deletion.
• Consider short transition shim with hard failure message if external adoption risk is high.
• Ensure all transport code uses modern HTTP abstractions consistently.

Acceptance Criteria

• Legacy HTTP pool/connection APIs removed from core.
• No deprecation warnings for these APIs remain (because APIs are gone).
• All network-related tests pass using modern client paths.

Suggested Tests

• Unit/integration coverage for catalog/file/report HTTP operations via modern APIs.
• Negative tests for removed constants/methods if compatibility policy requires explicit failure text.

[binford2k]

Deprecated in 66aff9d which indicates that there might still be some usage of the class.