Add MDC2020.fcl, a single detector-configuration epilog

[oksuzian]

Geometry and CRV set together, in the shape Run1B.fcl established. The MDC2020 geometry carries crv_counters_v09 and its 25 CRV sectors; selecting one without the other produces a job that runs and is wrong.

It works by winning on order rather than by changing anything: emitted after the base FCL, it lands after digitize/epilog.fcl and reco/epilog.fcl and overwrites the Run1A CRV values those pull in. No existing file is modified and no current-era job is affected -- verified by dumping seven entry points with and without the new file and diffing the resolved era keys.

Requires the Offline CRV MDC2020 epilogs to merge first.

Verified against the MDC2020 branch: identical resolved config for digitize/OnSpill, digitize/OffSpill, mixing/Mix, reco/OnSpill, reco/NoField, recoMC/OnSpill and recoMC/NoField.

[FNALbuild]

Hi @oksuzian,
You have proposed changes to files in these packages:

• JobConfig

which require these tests: build.

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⌛ The following tests have been triggered for bd8292f: build (Build queue - API unavailable)

About FNALbuild. Code review on Mu2e/Offline.

[FNALbuild]

☀️ The build tests passed at bd8292f.

Test	Result	Details
test with	✅	Command did not list any other PRs to include
merge	✅	Merged bd8292f at 9d4106e
build (prof)	✅	Log file. Build time: 04 min 21 sec
ceSimReco	✅	Log file.
g4test_03MT	✅	Log file.
transportOnly	✅	Log file.
POT	✅	Log file.
g4study	✅	Log file.
cosmicSimReco	✅	Log file.
cosmicOffSpill	✅	Log file.
ceSteps	✅	Log file.
ceDigi	✅	Log file.
muDauSteps	✅	Log file.
ceMix	✅	Log file.
rootOverlaps	✅	Log file.
g4surfaceCheck	✅	Log file.
FIXME, TODO	✅	TODO (0) FIXME (0) in 0 files
clang-tidy	✅	0 errors 0 warnings

N.B. These results were obtained from a build of this Pull Request at bd8292f after being merged into the base branch at 9d4106e.

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