Neo4j: detect web applications without relying on the dispatcherServlet bean

[codeconsole]

Summary

Follow-up to #15934, which retimes plugin bean registration to run before Spring Boot auto-configuration. Neo4jDataStoreSpringInitializer gates the open-session-in-view interceptor on containsBeanDefinition('dispatcherServlet') — a bean registered by Boot auto-configuration, so under the retimed lifecycle the check always returns false and the interceptor silently stops registering in web applications. This is the same defect #15934 found and fixed (with differential tests) in the hibernate5, hibernate7, and mongodb initializers.

The check still honours a dispatcherServlet definition when present, but otherwise tests whether the registry is the WebApplicationContext itself — a signal independent of auto-configuration ordering. Safe to merge before or after #15934: under the current lifecycle both signals agree.

Why inlined rather than shared

AbstractDatastoreInitializer.isWebApplicationRegistry() was added in grails-datamapping-core by #15934, but grails-data-neo4j is an independent Gradle build resolving grails-datamapping-core from published artifacts that don't yet contain the shared method. The method is mirrored here with identical logic (documented in its groovydoc); once this build depends on a grails-datamapping-core release that ships it, the local copy is a redundant override and can be deleted.

Verification

The identical logic is exercised in #15934 by new OpenSessionInViewSpec integration tests in the hibernate5 and hibernate7 app1 example apps (differential-tested: interceptor present on 8.0.x, absent under the retimed lifecycle before the fix, present after). The grails-data-neo4j build could not be run locally — it pins grails-gradle-plugins:6.1.2, which is not resolvable from Maven Central and requires credentials for repo.grails.org/restricted — so compile/test verification for this module relies on CI.

Related: #15934 (parent change and shared fix), #15755 (superseded design discussion).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.3416%. Comparing base (5e561da) to head (7690284).

Additional details and impacted files

@@                Coverage Diff                 @@
##                8.0.x     #15936        +/-   ##
==================================================
+ Coverage     49.3373%   49.3416%   +0.0043%     
+ Complexity      16775      16772         -3     
==================================================
  Files            1985       1985                
  Lines           93327      93327                
  Branches        16336      16336                
==================================================
+ Hits            46045      46049         +4     
+ Misses          40158      40150         -8     
- Partials         7124       7128         +4     

see 2 files with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: 7690284
▶️ Tests: 53792 executed
⚪️ Checks: 59/59 completed

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[jdaugherty]

B/c this source isn't part of our normal build, i've merged it to not loose track.