perf: send SLA doctypes in boot

[ankush]

This request is fired on every load, data rarely if ever changes though.

fix:

• send SLA doctypes via boot, eliminate the request.
• cache SLA doctypes

[codecov]

Codecov Report

Merging #36150 (bd9ef74) into develop (04400eb) will decrease coverage by 0.06%.
The diff coverage is 62.12%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #36150      +/-   ##
===========================================
- Coverage    64.21%   64.16%   -0.06%     
===========================================
  Files          785      782       -3     
  Lines        60681    60600      -81     
===========================================
- Hits         38965    38882      -83     
- Misses       21716    21718       +2     

Impacted Files	Coverage Δ
erpnext/accounts/report/financial_statements.py	31.07% <ø> (+0.11%)	⬆️
...ext/accounts/report/trial_balance/trial_balance.py	0.00% <ø> (ø)
erpnext/telephony/doctype/call_log/call_log.py	37.62% <6.66%> (-42.77%)	⬇️
...ctype/accounting_dimension/accounting_dimension.py	63.97% <25.00%> (ø)
erpnext/setup/doctype/holiday_list/holiday_list.py	77.17% <81.57%> (+35.63%)	⬆️
...service_level_agreement/service_level_agreement.py	83.18% <85.71%> (+0.03%)	⬆️
erpnext/hooks.py	100.00% <100.00%> (ø)
...cturing/doctype/production_plan/production_plan.py	80.20% <100.00%> (ø)

... and 2 files with indirect coverage changes