Upgrade to new vendored grpc

[damccorm]

Part 1/2 - once this is in I will remove the old vendored grpc artifacts

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[damccorm]

Failures so far:

• Spotless/RAT - caused by me checking in the test tempLib folder without licenses/formatting. Not a problem.
• https://github.com/apache/beam/actions/runs/12716051163/job/35535535369?pr=33555 - :sdks:java:io:mqtt:test is failing persistently. This is happening on master as well, so likely unrelated to this PR.
• https://github.com/apache/beam/actions/runs/12716051197/job/35535569874?pr=33555 - :runners:google-cloud-dataflow-java:worker:compileTestJava is failing persistently. The error is clearly caused by this PR:

/runner/_work/beam/beam/runners/google-cloud-dataflow-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/windmill/client/grpc/stubs/IsolationChannelTest.java:45: error: cannot find symbol
Iteration   1: 
import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.internal.NoopClientCall;
                                                           ^
  symbol:   class NoopClientCall
  location: package org.apache.beam.vendor.grpc.v1p69p0.io.grpc.internal

[damccorm]

Failures so far:

• Spotless/RAT - caused by me checking in the test tempLib folder without licenses/formatting. Not a problem.
• https://github.com/apache/beam/actions/runs/12716051163/job/35535535369?pr=33555 - :sdks:java:io:mqtt:test is failing persistently. This is happening on master as well, so likely unrelated to this PR.
• https://github.com/apache/beam/actions/runs/12716051197/job/35535569874?pr=33555 - :runners:google-cloud-dataflow-java:worker:compileTestJava is failing persistently. The error is clearly caused by this PR:

/runner/_work/beam/beam/runners/google-cloud-dataflow-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/windmill/client/grpc/stubs/IsolationChannelTest.java:45: error: cannot find symbol
Iteration   1: 
import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.internal.NoopClientCall;
                                                           ^
  symbol:   class NoopClientCall
  location: package org.apache.beam.vendor.grpc.v1p69p0.io.grpc.internal

Addressed the one real issue with 2d8cc11

[damccorm]

R: @Abacn

[github-actions]

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[Abacn]

testOnNewWorkerMetadata_redistributesBudget known flaky test: #28957