[DO NOT MERGE] Update Beam version to 2.78.0-SNAPSHOT

[damccorm]

Update beam.version to 2.78.0-SNAPSHOT and add the Apache Maven snapshot repository to pom.xml following the pattern from run-it-tests-beam-snapshots.yml.

[gemini-code-assist]

Summary of Changes

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This pull request updates the project's Apache Beam dependency to a snapshot version and configures the necessary Maven repository to resolve it. This change is intended to facilitate testing against the latest Beam development builds.

Highlights

• Dependency Update: Updated the beam.version property to 2.78.0-SNAPSHOT.
• Repository Configuration: Added the Apache Maven snapshot repository to the pom.xml to support the new snapshot version.

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[gemini-code-assist]

Code Review

This pull request updates the beam.version in pom.xml to 2.78.0-SNAPSHOT and adds the Apache Maven snapshot repository. We have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.30%. Comparing base (4364622) to head (af30ab7).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #4292       +/-   ##
=============================================
+ Coverage     34.34%   56.30%   +21.95%     
- Complexity      524     7855     +7331     
=============================================
  Files           216     1155      +939     
  Lines         13274    73277    +60003     
  Branches       1322     8594     +7272     
=============================================
+ Hits           4559    41257    +36698     
- Misses         8345    29234    +20889     
- Partials        370     2786     +2416     

Components	Coverage Δ
spanner-templates	84.46% <ø> (∅)
spanner-import-export	69.03% <ø> (∅)
spanner-live-forward-migration	88.91% <ø> (∅)
spanner-live-reverse-replication	80.82% <ø> (∅)
spanner-bulk-migration	88.96% <ø> (∅)
gcs-spanner-dv	88.02% <ø> (∅)
see 964 files with indirect coverage changes

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