Fix infinispan example: create the missing default cache on startup

[Croway]

Summary

camel infra run infinispan only provisions the default cache-container on the Infinispan server, it does not create a cache inside it (confirmed unchanged since at least the camel-4.22.0 tag in apache/camel — not a recent regression). The example's route uses to("infinispan://default"), which assumes the cache already exists, so following the documented README workflow (camel infra run infinispan + mvn spring-boot:run) throws CacheNotFoundException / NullPointerException. The test suite masked this by spinning up its own container with a hand-written, outdated infinispan.xml (schema 13.0) that predeclared the cache — so it never exercised the documented workflow and the regression went unnoticed.

Separately, the plaintext admin/password credentials in application.properties now trigger CamelSecurityPolicyAutoConfiguration "SECURITY WARNING: plain-text secret" warnings introduced in Camel 4.23.

Changes

• Add InfinispanConfiguration: a RemoteCacheManager @Bean that calls administration().getOrCreateCache("default", ...) on startup and is autowired into the infinispan component by type — the same pattern camel-infinispan's own IT tests use (InfinispanRemoteTestSupport#getOrCreateCache). No manual REST step required; the example runs OOTB again.
• Move connection settings out of camel.component.infinispan.* (now unused/redundant, since the component uses the bean directly) into plain infinispan.* properties backed by ${ENV_VAR:default} placeholders. This also resolves the plaintext-secret warnings, since CamelSecurityPolicyAutoConfiguration only scans camel.*-prefixed keys.
• Rewrite ApplicationTest to use camel-test-infra-infinispan's InfinispanServiceFactory + @DynamicPropertySource instead of a hand-rolled Testcontainers setup, so the test now exercises the exact same server config as camel infra run infinispan and would catch this kind of regression.
• Update the README to explain the cache-creation behavior and the env vars for pointing at a different server, and drop the now-inaccurate "runs OOTB" implication.

Test plan

• mvn test passes (spins up Infinispan via camel-test-infra-infinispan, verifies the route puts/gets a key through the auto-created cache)
• Verified live: camel infra run infinispan + mvn spring-boot:run — reproduced the original CacheNotFoundException/NPE before the fix, confirmed clean startup and Received body: test with no exceptions and no security warnings after the fix

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