Update water heater location

[willf]

Pull Request Description

Move out-of-unit water heaters (i.e., Water Heater In Unit=No from Location=None to Location=Conditioned Mechanical Room (corresponds to OS-HPXML location: "other heated space").

Note:

• Ideally out-of-unit WHs are modeled as shared centralized WHs, which have different pipe and tank losses than in-unit WH and would not have interactions with in-unit equipments such as HVAC. Central WH is not currently being modeled in ResStock, though that's changing soon with this PR and this PR.

• Water Heater Location.tsv is currently a tag that's not connected to any ResStockMeasures. This means out-of-unit WHs are currently modeled as in-unit WHs. The revised location should remove the HVAC-HPWH interaction. But the pipe loss is still underestimated with in-unit WH models.

resstock-estimation PR: https://github.com/Test-Cloned-Org/resstock-estimation/pull/395

Stats from test/base_results/baseline/annual/*:

Row Labels	count	Average of total_energy_mbtu	Average of load_delivered_m_btu	Average of tank_losses_m_btu
Attic	2	6.726	6.0515	0.462
Conditioned Mechanical Room	44	9.26368182	5.96754545	1.91309091
Crawlspace	2	5.1975	0.997	2.0995
Garage	63	9.81980952	6.40836508	2.08746032
Heated Basement	39	14.4264103	8.10228205	3.26838462
Living Space	151	10.8256424	6.41452318	2.21530464
Outside	8	11.867875	6.541625	2.964625
Unheated Basement	41	13.1755122	7.97468293	2.9404878

Checklist

Not all may apply:

• Tests (and test files) have been updated
• Documentation has been updated
  • If related to resstock-estimation, checklist includes data dictionary, source report, options saturation, options_lookup.
• Changelog has been updated
• openstudio tasks.rb update_measures has been run
• No unexpected regression test changes on CI (checked comparison artifacts)

_{Source: NREL on 2024-01-26.}