Shared scan for the phx_*_without_id checks.

offending_tag_lines/2 returns the source line of every tag in the HEEx templates of source_file that matches detect_attr.(text) but does not carry an id= attribute. Each concrete check supplies its own attribute detector and wraps these line numbers in a formatted issue.

Detection of open tags is intentionally restricted to standard and Phoenix component tags (<Tag>, <.component>); closing tags (</...) and HEEx interpolation (<%) are skipped because neither / nor % can follow < in the required shape.