chore(deps): update opentelemetry-dotnet monorepo to 1.19.0

[thomhurst]

This PR contains the following updates:

Package	Change	Age	Confidence
OpenTelemetry.Exporter.OpenTelemetryProtocol (source)	1.18.0 → 1.19.0
OpenTelemetry.Extensions.Hosting (source)	1.18.0 → 1.19.0

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Release Notes

open-telemetry/opentelemetry-dotnet (OpenTelemetry.Exporter.OpenTelemetryProtocol)

v1.19.0

Release details: 1.19.0

• Added Schema URL to internally created Resource instances.
• Added AlwaysRecordSampler.
• Added an AddOpenTelemetry extension method for IHostApplicationBuilder. It
  registers the OpenTelemetry SDK services and additionally seeds service.name
  from IHostEnvironment.ApplicationName and deployment.environment.name from
  IHostEnvironment.EnvironmentName as low-priority resource defaults. It also
  registers the host's live configuration into DI so that extensions receiving
  only IServiceCollection can contribute configuration sources during setup.
• Extended key/value list attribute handling to cover additional dictionary
  shapes (IEnumerable<KeyValuePair<string, string?>> and IDictionary). These
  attributes will be serialized as JSON objects or kvlist, as appropriate.
• If an exception is thrown when serializing an attribute, the attribute will now
  be dropped.
• Disable HttpClientFactory integration on browser WebAssembly (e.g. Blazor)
  environments to avoid stalled export requests when async HTTP handlers are used.
• Fixed CA certificate loading (e.g. using OTEL_EXPORTER_OTLP_CERTIFICATE) for
  PEM-encoded certificates that only contain a public key.
• Fixed CircularBufferBuckets so the first delta histogram insertion after a
  reset does not result in an unnecessary scale reduction.
• Fixed lazy logger provider builds after a failure from reusing partially
  initialized provider state.
• Fixed parsing of an inbound tracestate header whose member value trimmed to
  an empty value that previously threw an IndexOutOfRangeException internally
  and could silently truncate the tracestate.
• Prevented oversized metric metadata from being cached when it cannot fit within
  the configured request size.
• Reduced allocations when formatting self-diagnostics events with up to three parameters.
• Improved wildcard source/meter name matching to avoid excessive matching time
  at runtime.
• Reduced allocations when creating log record attributes from an array.
• Reduced allocations when setting baggage through the params overload.
• Reduced allocations when constructing SpanAttributes from an array.

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📝 Walkthrough

Walkthrough

The central package management file updates OpenTelemetry.Exporter.OpenTelemetryProtocol and OpenTelemetry.Extensions.Hosting from version 1.18.0 to 1.19.0.

Changes

OpenTelemetry package updates

Layer / File(s)	Summary
Update central package versions Directory.Packages.props	The centrally managed versions for two OpenTelemetry packages change from 1.18.0 to 1.19.0.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 6c5c1

The PR only updates centrally managed OpenTelemetry dependency versions, with no concrete merge-blocking risk identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: updating the OpenTelemetry .NET dependencies to version 1.19.0.

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_{A rabbit checks the package tree
Two OpenTelemetry versions leap free
From eighteen to nineteen they go
The central file records the flow
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