Use the new debug adapter with DS if both experiments are enabled

[DonJayamanne]

For #6907

[kimadeline]

Can DS debugging be done with any version of Python? The new DA should only be used with python 3.7.

[codecov-io]

Codecov Report

Merging #8365 into master will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff           @@
##           master    #8365   +/-   ##
=======================================
  Coverage   59.23%   59.23%           
=======================================
  Files         508      508           
  Lines       23236    23236           
  Branches     3750     3750           
=======================================
  Hits        13765    13765           
  Misses       8577     8577           
  Partials      894      894

Impacted Files	Coverage Δ
src/client/datascience/jupyter/jupyterDebugger.ts	10.47% <50%> (ø)	⬆️

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[DonJayamanne]

@kimadeline We're already checking that, see here

vscode-python/src/client/datascience/jupyter/jupyterDebugger.ts

Line 194 in 2a35dc9

if (!pythonVersion || pythonVersion.major < 3 || pythonVersion.minor < 7){