Convert exchange rate API to Java

[steven-sheehy]

Description:

• Add /api/v1/network/exchangerate to rest-java module
• Add k6 tests for rest-java exchange rate
• Add routes.exchangeRate with a default of false to Helm chart
• Change acceptance tests to route to both old and new endpoints
• Fix timestamp parameter regex in openapi.yml
• Resolve cross-site scripting attacks by not printing request values to response on validation failure

Related issue(s):

Fixes #12101

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
❌ -31.32% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (18ef799)	36925	33636	91.09%
Head commit (c8e94e2)	61006 (+24081)	36466 (+2830)	59.77% (-31.32%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#12166)	64	64	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[xin-hedera]

LGTM

[bilyana-gospodinova]

In the CI logs I see:
GET /api/v1/network/exchangerate in 3 ms: 404 No static resource
Perhaps something's missing.

[xin-hedera]

In the CI logs I see: GET /api/v1/network/exchangerate in 3 ms: 404 No static resource Perhaps something's missing.

That's expected since the acceptance workflow uses v0.139.0-rc3.

I'l check why the exchangerate requests are routed to rest-java, we may want to enable it later when an image becomes available, otherwise the workflow will always fail.