ICU-22322 Revert extra parallelism for data-filter test in .azure-pip…

…elines.yml

See #2471

.ci-builds/.azure-pipelines.yml

@@ -54,10 +54,13 @@ jobs:
  - checkout: self
  lfs: true
  fetchDepth: 10
+ # Note: This job uses `make -j2` instead of `make -j -l2.5` because with more parallelism (PR #2456)
+ # this check became flaky. The build apparently was not done copying one or another .ucm file before
+ # calling makeconv for it, although the Makefile has appropriate dependencies.
  - script: |
  cd icu4c/source && \
  ICU_DATA_FILTER_FILE=../../.ci-builds/data-filter.json ./runConfigureICU Linux && \
- make -j -l2.5 tests && \
+ make -j2 tests && \
  \[ ! -d data/out/build/icudt66l/translit \] && \
  (cd test/intltest && LD_LIBRARY_PATH=../../lib:../../tools/ctestfw ./intltest translit/TransliteratorTest/TestBasicTransliteratorEvenWithoutData)
  displayName: 'Build with Data Filter'