Remove pulse defaults for old fake 20q backends

[mtreinish]

Summary

The pulse defaults payload for the almaden, johannesburg, and singapore
fake backends are collectively taking up > 50% of the total disk
footprint of an installed copy of Qiskit. This is because the pusle
defaults for these backends predate the use the of parameterized pulse
definitions and contain arrays of sampled waveforms for the pulse
definitions. This exceedingly large file size slows down the entire
package and and makes it slower to install. When weighing the potential
value these defaults files provide for simulating and compiling with
pulse awareness for long retired devices against the real cost of
having the files included in the package there isn't a reason to keep
the files in the tree any longer. This commit removes the pulse
defaults files for these fake backends to greatly shrink the installed
package size of qiskit-terra.

Details and comments

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[jakelishman]

Absolutely fine by me to get rid of these. They're not so heavy for the download of the wheels (due to the compression), but it just seems like good bookkeeping to clear out cruft from devices that have been offline for however long.

[jakelishman]

Some of the tests explicitly use the Almaden, Johannesburg and Singapore fakes in part because they had pulse defaults - those will need changing over.

[nkanazawa1989]

I'm also fine with removing them. These pulse data could be used for pulse simulation, but Hamiltonian parameters in configuration are usually off from calibration and useless apart from testing of the visualization module (because we don't update Hamiltonian with calibrations).

[mtreinish]

ok, I've updated the tests to no longer rely on these backends having pulse defaults present. Hopefully things will pass now (this also caught a bug in the assembler which was masked by the use of the old backends).

[coveralls]

Pull Request Test Coverage Report for Build 3148486327

• 10 of 10 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.06%) to 84.508%

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Totals
Change from base Build 3148484315:	0.06%
Covered Lines:	60260
Relevant Lines:	71307

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💛 - Coveralls

[mtreinish]

The tutorials failure should be fixed once: Qiskit/qiskit-tutorials#1356 merges

[jakelishman]

Looks good to me - the diff looks cleaner without the +1,800 file as well! I'm never very sure if we should be making assertions about the exact forms of those giant reprs anyway.

[mtreinish]

Looks good to me - the diff looks cleaner without the +1,800 file as well! I'm never very sure if we should be making assertions about the exact forms of those giant reprs anyway.

Heh, that took me longer to track down than I care to admit. My default editor config was changing the whitespace and I thought I somehow broke the output as part of the unrelated change which is why I changed the backend and added that file. But once I figured out what I did wrong it was easy to fix.