Remove duplicate utility bill variables

[cpaulgilman]

Duplicate variables for electricity bill with system and electricty bill without sytem:

elec_cost_with_system, "Electricity bill with system", "$/yr"
utility_bill_w_sys, "Electricity bill with system", "$"

elec_cost_without_system, "Electricity bill with system", "$/yr"
utility_bill_wo_sys, "Electricity bill with system", "$"

I think the "elec_cost_" variables were originally added for the Third Party Ownership Host-Develpoer host indifference point metric (formerly known as "not to exceed" or "NTE"), and then ended up in other parts of the code. There doesn't seem to be any reason to have two versions of the electricity bill variables.

Note that this replaces the variables in older versions of the utilityrate module -- we can revert that if we only want to change utilityrate5.

This PR and the associated NatLabRockies/ssc#1276 include checking and replacing the variables in the following:

• Metrics, autographs, and cashflows scripts
• Report generator templates and scripts
• SSC test scripts
• Macros, including quickstart
• Cashflow Send-to-Excel workbooks
• LK script and PySAM samples in SAM, SSC, and PySAM repos.

Fixes #1879

Goes with NatLabRockies/ssc#1276

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.
• This change requires updating the PySAM files via export_config. Please see When do the PySAM files need to be regenerated?

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

[sjanzou]

All defaults running without issue and mini grid and wind wizard working and since outputs - no version upgrade necessary. Thanks for updating!

I committed the updated api files for when we merge into develop or patch for the new release or patch 1, respectively.