Upstream changes from NDSL development

[romanc]

Description

PyFV3 is currently using NDSL version 2025.03.00. When updating to the next version of NDSL, the following upstream changes are possible in PyFV3:

• In translate test workflow, don't set PACE_TEST_N_THRESHOLD_SAMPLES since the environment variable was renamed in PR Translate tests: no threshold analysis by default NDSL#134 and the default changed to match the currently configured behavior.
  To be merged with ci: Remove PACE_TEST_N_THRESHOLD_SAMPLES in translate tests #61.
• Breaking change: floating_point_precision() has to be replaced by get_precision(), see Remove deprecated floating_point_precision() NDSL#140.
  Done in Avoid deprecated floating_point_precision() #54.
• Direct GT4Py imports should be avoided. NDSL exposes (a subset of) the GT4Py functionality as ndsl.dsl.gt4py.
  To be merged with Removed Direct GT4Py Imports #51.
• If GT4Py is updated later than when refactor[cartesian]: remove explicit use of boost GridTools/gt4py#1971 was merged, we don't need the boost dependency anymore.
  To be merged with No boost dependency anymore #62

[romanc]

Since PyFV3's develop branch now tracks NDSL's develop branch, we don't need to keep track of things in this issue, but instead can just open PRs to propagate changes as they become available. All bullet points have been converted to PRs, so we can close this issue now.