GH WF: simplify some steps

[snazy]

Since diffplug/spotless#1215 has been closed, a few Github workflow steps can be simplified.

[codecov]

Codecov Report

Base: 75.48% // Head: 83.92% // Increases project coverage by +8.43% 🎉

Coverage data is based on head (85f7274) compared to base (dbccb12).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5869      +/-   ##
============================================
+ Coverage     75.48%   83.92%   +8.43%     
============================================
  Files           549       31     -518     
  Lines         16681     1493   -15188     
  Branches       1632      240    -1392     
============================================
- Hits          12592     1253   -11339     
+ Misses         3482      172    -3310     
+ Partials        607       68     -539     

Flag	Coverage Δ
java	∅ <ø> (∅)
javascript	∅ <ø> (∅)
python	83.92% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../org/projectnessie/gc/contents/jdbc/SqlDmlDdl.java
...org/projectnessie/api/v1/params/EntriesParams.java
...del/src/main/java/org/projectnessie/model/Tag.java
...jectnessie/client/http/v1api/HttpGetNamespace.java
...ctnessie/versioned/persist/adapter/Difference.java
.../versioned/persist/rocks/RocksDatabaseAdapter.java
...ain/java/org/projectnessie/client/http/Status.java
ui/src/App.tsx
...ssie/client/rest/NessieNotAuthorizedException.java
...g/projectnessie/client/api/OnReferenceBuilder.java
... and 508 more

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