Fix DynaCool driver init and temperature_setpoint cache update

[SherwanMicrosoft]

Summary

Fixes three bugs in qcodes.instrument_drivers.QuantumDesign.DynaCoolPPMS.DynaCool.DynaCool
that prevented the driver from instantiating against a real PPMS DynaCool and
from updating the temperature_setpoint cache after a temperature ramp.

Encountered while bringing up an SdH measurement on a Quantum Design PPMS DynaCool
on QCoDeS 0.57.0; all three issues are present on main as well.

Changes

1. block_while_ramping_temperature parameter (~line 84) — created with
   set_cmd=False / get_cmd=False, which makes the parameter read-only and
   causes add_parameter to reject the supplied initial_value=False. Changed
   to set_cmd=None / get_cmd=None so the parameter behaves as a
   cache-only settable, matching the existing docstring intent
   ("when set to True, will block further interaction…").

2. blocking_t_state_check_interval parameter (~line 93) — add_parameter
   already passes instrument=self automatically; the duplicate keyword raised
   a TypeError on driver construction. Removed.

3. _set_temperature_and_state cache update (~line 436) — referenced
   self.setpoint, which doesn't exist on this class. The corresponding
   parameter is self.temperature_setpoint. Fixed.

Test plan

Manually instantiated the driver against the real PPMS hardware
(TCPIP0::10.164.120.28::5000::SOCKET) and exercised:

• driver construction (previously raised on parameters 1 & 2)
• temperature_setpoint(...) round-trip (previously raised AttributeError
  inside the blocking branch on parameter 3)

No new tests added; these are integration-only paths against vendor hardware.

Newsfragment

Added under docs/changes/newsfragments/+dynacool-fixes.improved_driver
(will be renamed to <PR-number>.improved_driver once the PR number is
assigned).

[SherwanMicrosoft]

@microsoft-github-policy-service agree

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.80%. Comparing base (955704d) to head (bcfc09a).

Files with missing lines	Patch %	Lines
...ent_drivers/QuantumDesign/DynaCoolPPMS/DynaCool.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8097   +/-   ##
=======================================
  Coverage   70.80%   70.80%           
=======================================
  Files         302      302           
  Lines       31911    31911           
=======================================
  Hits        22593    22593           
  Misses       9318     9318           

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[jenshnielsen]

Thanks @SherwanMicrosoft The changes looks good to me