Update integrations to allow custom checkpoint locations (opensearch-…

…project#1501)

* Update integration type for new format

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Update integration type validator for new type

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Fix type errors in integration_reader

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Fix return types in adaptor

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Update integrations constants

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Fix local repository and local repository tests

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Fix remaining integrations unit tests

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Add integration format migration

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Fix frontend usage of integration assets

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Update integration install query iteration

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Add checkpoint field to setup form

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Update checkpoint text based on UI feedback

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Add new checkpoint usage to setup flow

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

* Split out integrations setup methods

Signed-off-by: Simeon Widdis <sawiddis@amazon.com>

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Signed-off-by: Simeon Widdis <sawiddis@amazon.com>