[CI] - Add default timeouts to cancel hanging jobs

[GuyAfik]

Description

• Do not run validate-changelog when running in master branch as its redundant, works in commit 1a64c34
• Add default-timeouts of 60 minutes for hanging jobs/steps, that means that If the steps / flows haven't finished in 1 hour, they will be automatically cancelled.
• Upgrade node to 20 from 16 as 16 is deprecated

[coveralls]

Pull Request Test Coverage Report for Build b36fcfc1-9767-406c-acf7-d1a96ba63a73

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 8025 unchanged lines in 290 files lost coverage.
• Overall coverage decreased (-18.4%) to 80.531%

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Files with Coverage Reduction	New Missed Lines	%
demisto_sdk/commands/common/clients/configs.py	1	97.14%
demisto_sdk/commands/common/content/objects/pack_objects/incident_field/incident_field.py	1	65.0%
demisto_sdk/commands/common/content/objects/pack_objects/job/job.py	1	83.33%
demisto_sdk/commands/common/content/objects/pack_objects/lists/lists.py	1	85.71%
demisto_sdk/commands/common/files/errors.py	1	71.43%
demisto_sdk/commands/common/files/text_file.py	1	78.13%
demisto_sdk/commands/common/hook_validations/deprecation.py	1	98.72%
demisto_sdk/commands/common/hook_validations/job.py	1	98.41%
demisto_sdk/commands/common/hook_validations/layout_rule.py	1	88.89%
demisto_sdk/commands/common/hook_validations/lists.py	1	96.55%

Totals
Change from base Build 7684887448:	-18.4%
Covered Lines:	35631
Relevant Lines:	44245

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💛 - Coveralls

[ilaner]

nice