fix path concatenation for non-root base endpoints, added test to check

[Kunals990]

Description

When base endpoint has a non-root path (e.g. /telemetry), default overrides for logs and metrics are now properly appended instead of replacing the base path.

Changes:

• Add normalizeAndJoinPaths method to handle URI path concatenation
• Fix path handling to preserve base path when joining URLs
• Support both absolute (/v1/metrics) and relative (v1/metrics) path formats
• Handle null base paths and trailing slashes correctly

Tests:

• Add shouldAppendPathsWithNonRootBase to verify non-root base path handling
• Add shouldHandlePathsWithoutLeadingSlash to verify relative path support

Fixes #1602

[jfallows]

This approach loses the ability to fully override the endpoint with a different URI that includes scheme host and port as well as path.

Suggested change

	this.metrics = normalizeAndJoinPaths(location, overrides.metrics);
	this.logs = normalizeAndJoinPaths(location, overrides.logs);
	}
	private URI normalizeAndJoinPaths(URI base, String path) {
	String basePath = base.getPath();
	if (basePath == null) {
	basePath = "/";
	}
	String pathToAppend = path;
	if (pathToAppend.startsWith("/")) {
	pathToAppend = pathToAppend.substring(1);
	}
	if (!basePath.endsWith("/")) {
	basePath += "/";
	}
	try {
	return new URI(
	base.getScheme(),
	base.getUserInfo(),
	base.getHost(),
	base.getPort(),
	basePath + pathToAppend,
	base.getQuery(),
	base.getFragment()
	);
	} catch (Exception e) {
	throw new RuntimeException("Failed to join URI paths", e);
	}
	this.metrics = resolveOverride(location, overrides.metrics);
	this.logs = resolveOverride(location, overrides.logs);
	}
	private URI resolveOverride(
	URI location,
	String override)
	{
	URI normalized = Optional.ofNullable(location.getPath())
	.map(p -> p.endsWith("/") ? p : p + "/")
	.map(location::resolve)
	.orElse(location.resolve("/"));
	URI overrideURI = Optional.of(URI.create(override))
	.map(...)
	// TODO: check for missing authority to treat as path only
	// TODO: if path has leading / then remove
	.get();
	// TODO: resolve overrideURI against normalized location to support absolute or relative overrides
	}

[jfallows]

Please add a test for full URI override, including scheme host and port that differ from base location.

[Kunals990]

@jfallows I've updated the PR based on your feedback:

• Implemented resolveOverride() method that checks for full URI overrides (scheme/authority)
• Preserves the ability to fully override endpoints with different scheme, host, and port
• Normalizes base path and properly appends relative override paths
• Added test shouldAllowFullUriOverrideWithNonRootBase() as requested

The implementation now supports both path appending for non-root bases and full URI overrides.

[jfallows]

@Kunals990 the PR build is broken seems due to checkstyle issues.

Please run a full local build ./mvnw clean install from top level to verify successful build and then push any needed changes to this PR so that the PR build can also succeed.