Add cilium_enable_bbr flag for cilium

[cyclinder]

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/kind api-change
/kind bug
/kind cleanup
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/kind feature

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What this PR does / why we need it:

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Does this PR introduce a user-facing change?:

network: Add cilium_enable_bbr flag for cilium bandwidth manager

[yankay]

/ok-to-test

[tico88612]

Thank you!

/lgtm

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[cyclinder]

Hi @yankay, Could you take a look? thanks!

[VannTen]

Suggested change

	{% if cilium_enable_bbr %}
	enable-bbr: "true"
	{% endif %}
	enable-bbr: "{{ cilium_enable_bbr | lower }}"

Unless there is a downside to explicitly set if to false ?

[cyclinder]

I prefer the current change, which prevents cilium from failing to start if the user-configured value is not true or false.

[VannTen]

That would be better addressed by a "is boolean" test in the validation tasks.