bluecoat,juniper_junos,juniper_netscreen: deprecate packages

[efd6]

What does this PR do?

Deprecates bluecoat, juniper_junos and juniper_netscreen.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes [Juniper JunOS] Deprecate JunOS package #6789
• Closes [Bluecoat] Deprecate Bluecoat Director package #6790
• Closes [Juniper Netscreen] Deprecate Netscreen package #6791

Screenshots

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Build stats

• Start Time: 2023-07-04T00:30:04.914+0000

• Duration: 17 min 35 sec

Test stats 🧪

Test	Results
Failed	0
Passed	21
Skipped	0
Total	21

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (3/3)	💚
Files	100.0% (3/3)	💚
Classes	100.0% (3/3)	💚
Methods	79.31% (23/29)	❕
Lines	84.375% (162/192)	❕
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package bluecoat - 0.17.0 containing this change is available at https://epr.elastic.co/search?package=bluecoat

[elasticmachine]

Package juniper_junos - 0.10.0 containing this change is available at https://epr.elastic.co/search?package=juniper_junos

[elasticmachine]

Package juniper_netscreen - 0.10.0 containing this change is available at https://epr.elastic.co/search?package=juniper_netscreen