velero

* add documentation for backup filters (#9967)

* add documentation for backup filters

Add user guide for fine grained backup filters with examples
from easy to advanced.

Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>

* address review comments

- enhanced example 3, explain how each item got excluded
- enhanced example 8, explain the exact match rule, and how the
  ordering affecting namespace that has  multiple match patterns
- cross link to restore side design
- fix the error msg to be consistent with implemenation

Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>

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Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>

* update backup filters example 14

update the excludeNames to match example 3 for better consistency.

Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>

* Support set-based filter label selectors (#10064)

* Support set-based filter label selectors

Use matchLabels/matchExpressions in fine-grained filters.

Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>

* omit the details of resource policy for cli

The reason to not resolve and display CLI is because it may go
out of sync, we want to avoid display it to mislead users.

We may consider to cpature those information and display it
in later release.

Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>

* update change log

Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>

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Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>