[7.x](backport #25708) Remove 32 bits version of Elastic Agent.

[mergify]

This is an automatic backport of pull request #25708 done by Mergify.

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[elasticmachine]

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Build stats

• Build Cause: Pull request #26215 updated

• Start Time: 2021-06-15T20:20:17.423+0000

• Duration: 100 min 35 sec

• Commit: 3216164

Test stats 🧪

Test	Results
Failed	0
Passed	6860
Skipped	24
Total	6884

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Test stats 🧪

Test	Results
Failed	0
Passed	6860
Skipped	24
Total	6884