Add remaining nidigital system tests (excluding repeated capabilities)

[ni-jfitzger]

• This contribution adheres to CONTRIBUTING.md.

• I've updated CHANGELOG.md if applicable.

• I've added tests applicable for this pull request

What does this Pull Request accomplish?

• Adds nidigital system test test_close
• Adds nidigital system test test_get_fail_count
• Adds nidigital system test test_send_software_edge_trigger

List issues fixed by this Pull Request below, if any.

What testing has been done?

Ran nidigital system tests on a system with nidigital 19.0.1 installed.

[codecov]

Codecov Report

Merging #1441 into master will increase coverage by 1.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1441      +/-   ##
==========================================
+ Coverage   91.92%   93.28%   +1.35%     
==========================================
  Files          20       23       +3     
  Lines        3655     5016    +1361     
==========================================
+ Hits         3360     4679    +1319     
- Misses        295      337      +42     

Flag	Coverage Δ
#codegenunittests	88.24% <ø> (ø)
#nidigitalsystemtests	96.91% <ø> (?)
#nifakeunittests	96.40% <ø> (ø)
#nifgensystemtests	96.91% <ø> (?)
#nimodinstunittests	95.37% <ø> (ø)
#nitclkunittests	95.45% <ø> (ø)

Impacted Files	Coverage Δ
...digital/nidigital/history_ram_cycle_information.py	100.00% <0.00%> (ø)
generated/nidigital/nidigital/_library.py	96.77% <0.00%> (ø)
generated/nifgen/nifgen/_library.py	96.91% <0.00%> (ø)

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[sbethur]

test this please

[sbethur]

test this please