chore: release 1.x SDKs for O11y GA (#351)

## Summary

Prepare for Observability General Availability.

## How did you test this change?

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## Are there any deployment considerations?

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Manifest-only version bumps with no runtime code changes; risk is
limited to release automation producing 1.0.0 tags/packages for the
listed SDKs.
> 
> **Overview**
> Bumps release-please manifest versions to `1.0.0` for the Go and core
observability SDK packages (`sdk/@launchdarkly/observability`,
`-dotnet`, `-node`, `-python`) and `sdk/@launchdarkly/session-replay`,
aligning them for a 1.x/GA release.
> 
> Leaves `observability-android`, `observability-react-native`, and
`highlight-run` unchanged.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
c25bd92. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: Vadman97

.release-please-manifest.json

@@ -1,11 +1,11 @@
 {
-	"go": "0.4.0",
-	"sdk/@launchdarkly/observability": "0.5.2",
+	"go": "1.0.0",
+	"sdk/@launchdarkly/observability": "1.0.0",
 	"sdk/@launchdarkly/observability-android": "0.24.0",
-	"sdk/@launchdarkly/observability-dotnet": "0.3.0",
-	"sdk/@launchdarkly/observability-node": "0.3.1",
-	"sdk/@launchdarkly/observability-python": "0.1.1",
+	"sdk/@launchdarkly/observability-dotnet": "1.0.0",
+	"sdk/@launchdarkly/observability-node": "1.0.0",
+	"sdk/@launchdarkly/observability-python": "1.0.0",
 	"sdk/@launchdarkly/observability-react-native": "0.7.0",
-	"sdk/@launchdarkly/session-replay": "0.5.2",
+	"sdk/@launchdarkly/session-replay": "1.0.0",
 	"sdk/highlight-run": "9.26.0"
 }