nirfsg ext cal date time method name change and wait until settled parameter update

[vnktshr21]

• 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?

• Changed the name of get_external_calibration_last_date_and_time to get_ext_cal_last_date_and_time
• Updated wait_until_settled method to have max_time_milliseconds parameter as type hightime.timedelta with a default value of 10 seconds

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

None

What testing has been done?

Verified build succeeds.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.09%. Comparing base (c79aaea) to head (05c231c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2149   +/-   ##
=======================================
  Coverage   90.08%   90.09%           
=======================================
  Files          71       71           
  Lines       18643    18644    +1     
=======================================
+ Hits        16795    16797    +2     
+ Misses       1848     1847    -1     

Flag	Coverage Δ
codegenunittests	84.44% <ø> (ø)
nidcpowersystemtests	94.65% <ø> (+0.04%)	⬆️
nidcpowerunittests	89.53% <ø> (ø)
nidigitalsystemtests	92.26% <ø> (ø)
nidigitalunittests	68.44% <ø> (ø)
nidmmsystemtests	92.72% <ø> (ø)
nifakeunittests	85.52% <ø> (ø)
nifgensystemtests	94.61% <ø> (ø)
nimodinstsystemtests	73.85% <ø> (ø)
nimodinstunittests	94.20% <ø> (ø)
nirfsgsystemtests	82.43% <100.00%> (+<0.01%)	⬆️
niscopesystemtests	92.94% <ø> (ø)
niscopeunittests	43.20% <ø> (ø)
nisesystemtests	91.50% <ø> (ø)
niswitchsystemtests	82.03% <ø> (ø)
nitclksystemtests	94.87% <ø> (ø)
nitclkunittests	98.26% <ø> (ø)

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Files with missing lines	Coverage Δ
generated/nirfsg/nirfsg/session.py	90.31% <100.00%> (+0.01%)	⬆️

... and 1 file with indirect coverage changes

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