file_min_digits: 5->6 (#2385)

* file_min_digits: 5->6

100k+ step runs are quite common in WarpX. To simplify
post-processing scripts, increase the default to pad to 6 digits.

This might break some hand-written scripts that use `?????`
wild-cards over `*` wildcards in regex and thus need to be updated.
But it at the same time simplifies regexes for analysis of data
series and listing of such file series.

* Update Scripts to Handle New File Names

* Fix CI Test pml_x_psatd

* Fix CI Test divb_cleaning_3d

* Fix CI Tests with EB Support

* Fix CI Tests with RZ Support

* Fix CI Tests with PICMI Support

* Use glob in Analysis of Collision Tests

* Use rstrip in Analysis of Collision Tests

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Fix CI Tests for Langmuir_multi_1d/psatd

* Fix CI Tests for LaserInjection_1d

* Checkpoint-Restart Tests: 5 Digits

`regtest.py` in `regression_testing` hard-codes 5 digits:
```diff
--- a/regtest.py
+++ b/regtest.py
@@ -734,7 +734,7 @@ def test_suite(argv):
                 shutil.move(test.diffDir, orig_diff_dir)

             # get the file number to restart from
-            restart_file = "%s_chk%5.5d" % (test.name, test.restartFileNum)
+            restart_file = "%s_chk%6.6d" % (test.name, test.restartFileNum)
```

* PICMI Restart Tests: `warpx_file_min_digits = 5`

Same as other CI restart tests: hard-coded value in regression
suite makes this necessary.

X-ref: https://github.com/AMReX-Codes/regression_testing/issues/119

Co-authored-by: Edoardo Zoni <ezoni@lbl.gov>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

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