ci: fix the pom.xml for Central API

[suztomo]

New Maven Central API has more strict pom.xml validation than the
old Maven publication. Let's fix the problem:

{
  "pkg:maven/com.google.cloud.bigtable/[email protected]": [
    "Project name is missing",
    "Dependency management dependency version information is missing for dependency: org.conscrypt:conscrypt-openjdk-uber",
    "Dependency management dependency version information is missing for dependency: org.conscrypt:conscrypt-openjdk",
    "Dependency management dependency version information is missing for dependency: javax.annotation:javax.annotation-api",
    "Dependency management dependency version information is missing for dependency: org.checkerframework:checker-qual",
    "Dependency management dependency version information is missing for dependency: com.google.code.findbugs:jsr305"
  ],
  "pkg:maven/com.google.cloud.bigtable/[email protected]": [
    "Project name is missing"
  ],
  "pkg:maven/com.google.cloud.bigtable/[email protected]": [
    "Project name is missing",
    "Dependency management dependency version information is missing for dependency: org.conscrypt:conscrypt-openjdk-uber",
    "Dependency management dependency version information is missing for dependency: org.conscrypt:conscrypt-openjdk",
    "Dependency management dependency version information is missing for dependency: javax.annotation:javax.annotation-api",
    "Dependency management dependency version information is missing for dependency: org.checkerframework:checker-qual",
    "Dependency management dependency version information is missing for dependency: com.google.code.findbugs:jsr305"
  ],
  "pkg:maven/com.google.cloud.bigtable/[email protected]": [
    "Project name is missing"
  ],
  "pkg:maven/com.google.cloud.bigtable/[email protected]": [
    "Project name is missing"
  ],
  "pkg:maven/com.google.cloud.bigtable/[email protected]": [
    "Project name is missing"
  ],
  "pkg:maven/com.google.cloud.bigtable/[email protected]": [
    "Project name is missing"
  ]
}

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• Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> ☕️

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[suztomo]

[INFO] --- bigtable-build-helper:2.15.3:verify-shaded-exclusions (verify-shaded-exclusions) @ bigtable-hbase-1.x-shaded ---
[WARNING] Found stale excludes in shading config:
[WARNING] log4j:log4j
[WARNING] org.conscrypt:conscrypt-openjdk
[ERROR] com.google.code.findbugs:jsr305 was excluded from the shaded jar, but is not listed in the dependency-reduced-pom.xml
[ERROR] javax.annotation:javax.annotation-api was excluded from the shaded jar, but is not listed in the dependency-reduced-pom.xml
[ERROR] org.checkerframework:checker-qual was excluded from the shaded jar, but is not listed in the dependency-reduced-pom.xml
[ERROR] org.conscrypt:conscrypt-openjdk-uber was excluded from the shaded jar, but is not listed in the dependency-reduced-pom.xml

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[suztomo]

Duplicate of #4501

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