Move the xray allowdot feature gate to beta stage (#32694)

**Description:** 
Moving xray exporter allow-dot feature gate from alpha to beta stage

It's a follow up change for
#31732

**Testing:** Unit test

**Documentation:** 


https://github.com/XinRanZhAWS/opentelemetry-collector-contrib/blob/f0863f481445e7205e3096a9a536463e3a51de81/.chloggen/xray_exporter_allow_dot_annotation.yaml

Purpose of this feature gate:

In the past, X-Ray doesn’t support “.”. So we have a translator in x-ray
export to translates it to “_” before sending traces to X-Ray Service.

To match otel naming style, x-ray service team decide to change their
service to support both "." type and "" type of naming. In this case the
translator that translate "." to "" is no-longer needed. This PR change
the way this translator work

X-Ray PMs agree on rolling out this change by using feature-gate

.chloggen/xrayexporter-dot-converter-featuregate-beta.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: awsxrayexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: change x-ray exporter's translator to make "." split annotation pass as-is
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [32694, 31732]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: This change make below change to beta stage for feature gate 'exporter.xray.allowDot'，this change will let the change mention below enable by default | In the past, X-Ray doesn’t support “.”. So we have a translator in x-ray export to translates it to “_” before sending traces to X-Ray Service. | To match otel naming style, x-ray service team decide to change their service to support both "." type and "" type of naming. In this case the translator that translate "." to "" is no-longer needed. This PR change the way this translator work | X-Ray PMs agree on rolling out this change by using feature-gate
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/awsxrayexporter/internal/translator/segment.go

@@ -52,7 +52,7 @@ var (
 var (
 	remoteXrayExporterDotConverter = featuregate.GlobalRegistry().MustRegister(
 		"exporter.xray.allowDot",
-		featuregate.StageAlpha,
+		featuregate.StageBeta,
 		featuregate.WithRegisterDescription("X-Ray Exporter will no longer convert . to _ in annotation keys when this feature gate is enabled. "),
 		featuregate.WithRegisterFromVersion("v0.97.0"),
 	)