docs: upgrade notes for the camel-spring-boot 4.23 starter changes

[Croway]

Adds the 4.23 upgrade guide entries for the camel-spring-boot changes that are landing under these tickets, next to the camel-spring-boot entries already present for the release:

• CAMEL-24498 camel-observability-services-starter narrows its injected defaults (CAMEL-24498: align camel-observability-services-starter defaults with the Spring Boot baseline camel-spring-boot#1927)
• CAMEL-24500 camel-debug-starter no longer opens a JMX connector by default (CAMEL-24500: camel-debug-starter does not open a JMX connector by default camel-spring-boot#1928)
• CAMEL-24592 health check stack traces moved to the full exposure level (CAMEL-24592: only expose health check stack traces in full exposure level camel-spring-boot#1929)
• CAMEL-24593 camel-platform-http-starter deletes multipart uploads when the exchange completes (CAMEL-24593: platform-http-starter - delete multipart uploads when the exchange is done camel-spring-boot#1934)
• CAMEL-24577 camel-platform-http-starter path variables follow the matched path (CAMEL-24577: platform-http path variables follow the path Spring matched camel-spring-boot#1932)
• CAMEL-24505 camel-micrometer-starter bounds the uri tag (CAMEL-24505: camel-micrometer-starter - bound the uri metric tag camel-spring-boot#1933)
• CAMEL-24506 camel-jasypt-starter defaults to PBEWITHHMACSHA256ANDAES_256 (CAMEL-24506: camel-jasypt-starter - modern default algorithm and safer usage example camel-spring-boot#1931)
• CAMEL-24501 starter configuration options that cannot be bound are reported (CAMEL-24501: Report starter configuration options that cannot be bound camel-spring-boot#1935)

Documentation only. Each entry should be merged together with, or after, the PR it describes; entries for PRs that end up not merged for 4.23 should be dropped from this one.

Claude Code on behalf of Croway

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[gnodet]

Documentation-only PR adding 8 upgrade guide entries for camel-spring-boot 4.23 starter changes. Each entry accurately documents a behavioral/default change with clear migration instructions and opt-back properties. AsciiDoc formatting is correct and consistent with existing entries. Well-placed under the existing === camel-spring-boot section.

📋 PR Metadata

Aspect	Current	Suggested
Milestone	(none)	4.23.0

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Claude Code on behalf of Guillaume Nodet