ci: use the releaseNotification step

[v1v]

What

Use elastic/apm-pipeline-library#976 to simplify the body manipulation
Enable email/slack communications when a tag release has created

Actions

• Need the above-mentioned PR and also a release ✅
• email address?

[codecov-io]

Codecov Report

Merging #1659 (3665a17) into master (3714579) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1659   +/-   ##
=========================================
  Coverage     58.93%   58.94%           
  Complexity       92       92           
=========================================
  Files           404      404           
  Lines         18440    18440           
  Branches       2561     2561           
=========================================
+ Hits          10868    10869    +1     
- Misses         6802     6803    +1     
+ Partials        770      768    -2     

Impacted Files	Coverage Δ	Complexity Δ
...ic/apm/agent/profiler/collections/LongHashSet.java	16.66% <0.00%> (ø)	0.00% <0.00%> (ø%)
...o/elastic/apm/agent/profiler/SamplingProfiler.java	73.52% <0.00%> (+0.23%)	0.00% <0.00%> (ø%)

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💚 Build Succeeded

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Build stats

• Build Cause: Pull request #1659 updated

• Start Time: 2021-05-14T08:17:26.719+0000

• Duration: 55 min 45 sec

• Commit: 7587645

Test stats 🧪

Test	Results
Failed	0
Passed	1815
Skipped	14
Total	1829

Trends 🧪

💚 Flaky test report

Tests succeeded.

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Test stats 🧪

Test	Results
Failed	0
Passed	1815
Skipped	14
Total	1829

[SylvainJuge]

@v1v do you think we could review & merge this as-is, or does it still needs few changes before it's ready ?

As it's release we might not be able to test it properly until the next release, but given it's only about notifications we should not expect breaking changes here.

[cachedout]

👍