[v24.2.x] admin: add cloud_storage_cache_size check to config_multi_property_validation()
#23357
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To encapsulate the logic for validating a `cluster` level configuration
for the properties `cloud_storage_cache_size` and `cloud_storage_cache_size_percent`.
The following configurations are determined to be invalid:
1. `cloud_storage_cache_size` and `cloud_storage_cache_size_percent`
cannot both be 0
2. `cloud_storage_cache_size` cannot be 0 while
`cloud_storage_cache_size_percent` is nil (`std::nullopt`)
(cherry picked from commit ff73a96)
To prevent the invalid configuration of `cloud_storage_cache_size` and `cloud_storage_cache_size_percent` both equal to 0, add a new check to the `admin` server validation post `patch_cluster_config_handler()` call. Validation is performed at the admin endpoint level to prevent users from configuring the cluster settings to one of these invalid states, which would result in the cloud cache calculating its max size as 0. (cherry picked from commit d4674d6)
(cherry picked from commit 0df8fdd)
WillemKauf
approved these changes
Sep 18, 2024
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Backport of PR #23337