chore: Update sip.md to have a better call to action

[rusackas]

SUMMARY

Changing the Issues template to be more descriptive about SIPs

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #25822 (d0edc45) into master (e1eb985) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #25822      +/-   ##
==========================================
- Coverage   68.97%   68.94%   -0.04%     
==========================================
  Files        1938     1938              
  Lines       75611    75611              
  Branches     8417     8417              
==========================================
- Hits        52151    52128      -23     
- Misses      21299    21322      +23     
  Partials     2161     2161              

Flag	Coverage Δ
hive	53.68% <ø> (ø)
javascript	56.19% <ø> (ø)
mysql	78.37% <ø> (?)
postgres	?
presto	53.63% <ø> (ø)
python	82.74% <ø> (-0.07%)	⬇️
unit	55.48% <ø> (ø)

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see 22 files with indirect coverage changes

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