rename price signals dispatch to retail rate

[brtietz]

Pull Request Template

Description

Renames price signals dispatch to retail rate dispatch

Fixes #1123

Companion SSC PR: NREL/ssc#1064

To test: ensure retail rates dispatch UI forms load and dispatch runs for PV+Battery, generic system battery and stand alone battery, as well as hybrids configurations (all BTM).

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• This change modifies variables in existing compute modules. Please see Checking for PySAM Incompatible API Changes.

Checklist:

If you have added a new compute module in a SSC pull request related to this one, be sure to check the Process Requirements.

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[brtietz]

Convert to draft until I figure out why Ubuntu build is stuck at case 113

[brtietz]

The solution was additional changes to startup.lk for the fuel cell and hybrids configurations. Ready for review.