fix: Add ability to override machine name

[unclesp1d3r]

Fixes #118

Add ability to override machine name with custom labels for agents.

• Admin Interface: Add custom_label to resource_params method in app/controllers/admin/agents_controller.rb. Add input field for custom_label in app/views/agents/_form.html.erb.
• Database Schema: Create migration to add custom_label column to agents table with a comment. Create migration to rename name column to host_name in agents table.
• Model Changes: Add custom_label attribute to Agent model. Validate presence and length of host_name. Validate length and uniqueness of custom_label if not nil. Rename name property to host_name. Make name property return either custom_label or host_name.
• Dashboard Updates: Add custom_label to ATTRIBUTE_TYPES and SHOW_PAGE_ATTRIBUTES in app/dashboards/agent_dashboard.rb. Remove name from FORM_ATTRIBUTES.
• RSpec Tests: Add rspec to test that the name is overridden correctly when a custom_label is set in spec/models/agent_spec.rb. Update factory for Agent to include custom_label in spec/factories/agent.rb.
• Remove Duplicates: Remove duplicate SPDX-FileCopyrightText lines in various helper files and config/routes.rb.

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[codeclimate[bot]]

Code Climate has analyzed commit ae7ce2e6 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 83.3% (50% is the threshold).

This pull request will bring the total coverage in the repository to 59.3% (0.0% change).

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