Fix test failure in CI

[BYK]

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Fixes a test failure where getSpotlightConfig was returning empty or whitespace-only strings for SENTRY_SPOTLIGHT environment variables, instead of undefined. This change explicitly filters out such values, aligning the function's behavior with test expectations and preventing invalid Spotlight configurations.

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[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	24.6 kB	added	added
@sentry/browser - with treeshaking flags	23.09 kB	added	added
@sentry/browser (incl. Tracing)	41.26 kB	added	added
@sentry/browser (incl. Tracing, Profiling)	45.53 kB	added	added
@sentry/browser (incl. Tracing, Replay)	79.73 kB	added	added
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	69.4 kB	added	added
@sentry/browser (incl. Tracing, Replay with Canvas)	84.42 kB	added	added
@sentry/browser (incl. Tracing, Replay, Feedback)	96.58 kB	added	added
@sentry/browser (incl. Feedback)	41.27 kB	added	added
@sentry/browser (incl. sendFeedback)	29.27 kB	added	added
@sentry/browser (incl. FeedbackAsync)	34.2 kB	added	added
@sentry/react	26.29 kB	added	added
@sentry/react (incl. Tracing)	43.22 kB	added	added
@sentry/vue	29.09 kB	added	added
@sentry/vue (incl. Tracing)	43.03 kB	added	added
@sentry/svelte	24.61 kB	added	added
CDN Bundle	26.95 kB	added	added
CDN Bundle (incl. Tracing)	41.85 kB	added	added
CDN Bundle (incl. Tracing, Replay)	78.38 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback)	83.85 kB	added	added
CDN Bundle - uncompressed	78.92 kB	added	added
CDN Bundle (incl. Tracing) - uncompressed	124.08 kB	added	added
CDN Bundle (incl. Tracing, Replay) - uncompressed	240.11 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	252.87 kB	added	added
@sentry/nextjs (client)	45.34 kB	added	added
@sentry/sveltekit (client)	41.64 kB	added	added
@sentry/node-core	50.87 kB	added	added
@sentry/node	158.06 kB	added	added
@sentry/node - without tracing	92.74 kB	added	added
@sentry/aws-serverless	106.5 kB	added	added

[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	9,135	-	-	added
GET With Sentry	1,399	15%	-	added
GET With Sentry (error only)	6,215	68%	-	added
POST Baseline	1,231	-	-	added
POST With Sentry	528	43%	-	added
POST With Sentry (error only)	1,090	89%	-	added
MYSQL Baseline	3,399	-	-	added
MYSQL With Sentry	527	16%	-	added
MYSQL With Sentry (error only)	2,770	81%	-	added