chore(redhat): handle CentOS Stream releases

[YoannGh]

Description

This PR adds support for the CentOS Stream OS type family and detects it through the existing CentOS analyzer.
It uses the CentOS Stream prefix in the /etc/centos-release file to detect this OS type family.

$ cat /etc/centos-release 
CentOS Stream release 9

Related issues

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• I've added tests that prove my fix is effective or that my feature works.
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[knqyf263]

CentOS and CentOS stream have different relationships to RHEL and Fedora. I believe it should not be treated in the same way as CentOS, as the security advisories are also different.

What if adding a new family for CentOS Stream?

[YoannGh]

@knqyf263 my last commit adds a new CentOSStream OS type family and makes use of it in the centos analyzer.
Let me know if that suits what you want

[knqyf263]

I think we should also think about EOL.

trivy/pkg/detector/ospkg/redhat/redhat.go

Lines 45 to 61 in e5f7d29

	redhatEOLDates = map[string]time.Time{
	"4": time.Date(2017, 5, 31, 23, 59, 59, 0, time.UTC),
	"5": time.Date(2020, 11, 30, 23, 59, 59, 0, time.UTC),
	"6": time.Date(2024, 6, 30, 23, 59, 59, 0, time.UTC),
	// N/A
	"7": time.Date(3000, 1, 1, 23, 59, 59, 0, time.UTC),
	"8": time.Date(3000, 1, 1, 23, 59, 59, 0, time.UTC),
	"9": time.Date(3000, 1, 1, 23, 59, 59, 0, time.UTC),
	}
	centosEOLDates = map[string]time.Time{
	"3": time.Date(2010, 10, 31, 23, 59, 59, 0, time.UTC),
	"4": time.Date(2012, 2, 29, 23, 59, 59, 0, time.UTC),
	"5": time.Date(2017, 3, 31, 23, 59, 59, 0, time.UTC),
	"6": time.Date(2020, 11, 30, 23, 59, 59, 0, time.UTC),
	"7": time.Date(2024, 6, 30, 23, 59, 59, 0, time.UTC),
	"8": time.Date(2021, 12, 31, 23, 59, 59, 0, time.UTC),
	}

Now, I'm confused about its security advisories. CentOS Stream is ahead of RHEL, but the FAQ mentioned as below.

Security issues will be updated in CentOS Stream after they are solved in the current RHEL release

https://centos.org/distro-faq/

It sounds like the same as CentOS.
@YoannGh Do you know anything?

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