[19.0][MIG] hr_*: overtime + skills refactor (4 submodules)

[dnplkndll]

What

Adds upgrade_analysis_work.txt for 4 hr_* submodules with
substantial 19.0 deltas: hr_attendance, hr_holidays_attendance,
hr_skills, hr_recruitment_skills.

Companion to #5634 (13 simple hr_* submodules). Split this way for
focused review of the model-rename refactors.

Why

The substantial change here is two model renames already in
apriori.renamed_models:

18.0 model	19.0 model	Touched in
hr.attendance.overtime	hr.attendance.overtime.line	hr_attendance, hr_holidays_attendance
hr.candidate.skill	hr.applicant.skill	hr_recruitment_skills

Apriori handles both via update_module_names /
rename_models in base/19.0.1.3/pre-migration.

The m2m hr.applicant.skill_ids analysis line reads
table is now 'hr_applicant_hr_skill_rel' ('False'). The 18.0 value
False indicates the table name was unspecified, so Odoo
auto-named it. For hr.applicant ↔ hr.skill, the
alphabetically-sorted auto-name is hr_applicant_hr_skill_rel —
identical to the new explicit name. No rename_tables needed.
Same reasoning for any analogous m2m in hr_skills.

Other changes are auto-handled:

• NEW models (overtime rule, ruleset, skill history report,
  certification report, hr.individual.skill.mixin, hr.job.skill) —
  created by the 19.0 module load.
• NEW fields all carry hasdefault: default or
  hasdefault: compute.
• NEW required+function-stored fields (e.g. hr.attendance.date,
  hr.attendance.overtime.line.status) — Odoo computes at
  registry init.
• DEL fields/views/access/rules/menus — preserved per [19.0][MIG] partner_autocomplete: cleanup obsolete res.partner/res.company fields #5631 review;
  database_cleanup handles residuals once the new version is in
  active use.

How

Pure annotations, no code. Each work-doc has one # DONE block for
the apriori-handled model rename plus one # NOTHING TO DO per
populated section.

Scope notes

• hr, hr_expense, hr_holidays, hr_work_entry already
  done in earlier PRs.
• hr_recruitment is in flight by @hbrunn in [19.0][MIG] hr_recruitment #5612 — not touched.
• hr_recruitment_survey and hr_work_entry_holidays had no
  analysis diff; skipped, will be picked up on a future analyzer
  regen.

Test plan

• pre-commit run --files <all new files>: clean.
• OCA CI green.

Related PRs

• [19.0][IMP] hr: backfill NULL create_date/write_date on hr_employee #5628 (open) [19.0][IMP] hr: backfill NULL create_date/write_date
• [19.0][FIX] loyalty: clear stale mail.template.lang referencing removed _get_mail_partner #5629 (merged) [19.0][FIX] loyalty: clear stale mail.template.lang
• [19.0][MIG] website_*: complete analyses for 31 uncharted modules #5633 (open) [19.0][MIG] website_*: complete analyses for 31 modules
• [19.0][MIG] hr_*: analyses for 13 simple submodules #5634 (open) [19.0][MIG] hr_*: 13 simple submodules (companion)