Update github template and remove Jet dependency

[BrianCurtis-NOAA]

DESCRIPTION OF CHANGES:

Jet is no longer tested, and still supported until its removal.

These changes update the PR template, and i've made some adjustments to the template with how I run the testing.

TESTING

NO TESTING NEEDED!

DEPENDENCIES:

• None

DOCUMENTATION:

• Doxygen does not need updates.
• Doxygen is updated.

LINKED ISSUES:

Partially addresses #1129

================== THIS IS WHAT THE TEMPLATE LOOK LIKE ==================

DESCRIPTION OF CHANGES:

TESTING

WHICH CONSISTENCY TESTS TO RUN:

• chgres_cube
• cpld_gridgen
• global_cycle
• grid_gen
• ice_blend
• ocnice_prep
• regrid_sfc
• snow2mdl
• weight_gen

TESTS CONDUCTED:

• Compile branch using Intel:
  • Orion
  • Ursa
  • Hercules
  • WCOSS2
• Compile branch using GNU:
  • Ursa
• Compile branch in 'Debug' mode:
  • WCOSS2
• Compile with Doxygen with no errors.
• Run unit tests on any Tier 1 machine.
• Run relevant consistency tests:
  • Orion
  • Ursa
  • Hercules
  • WCOSS2

Optional test.

• Run full set of chgres_cube consistency tests on Ursa.

Describe any additional tests performed.

DEPENDENCIES:

DOCUMENTATION:

• Doxygen does not need updates.
• Doxygen is updated.

LINKED ISSUES:

CONTRIBUTORS (optional):

=====================================================

[BrianCurtis-NOAA]

@DavidHuber-NOAA please review, quick change to PR template.

[DavidHuber-NOAA]

Looks good!