Added SQL file to facilitate deleting an EVLA EB from archive db

apps/cli/utilities/infrastructure_testing_scripts/delete_evla_eb_metadata.sql

+-- To use: Install the below two functions, and then run the latter on an EB you want to delete, like:
+-- 		select delete_metadata_for_evla_eb('15A-397.sb31019491.eb31020561.57236.7198700463');
+
+create or replace function get_info_for_evla_eb_deletion(eb_fileset_id varchar, out science_product_locator VARCHAR, out filegroup_ids int[], out product_group_id int, out execution_block_id int, out observation_configuration_ids int[]) as $$
+declare ancillary_fg_ids int[];
+BEGIN
+science_product_locator := science_products.science_product_locator from science_products where external_name = eb_fileset_id;
+filegroup_ids[1] := filegroup_id from science_products where external_name = eb_fileset_id;
+product_group_id := science_products_product_groups.product_group_id FROM science_products_product_groups WHERE science_products_product_groups.science_product_locator=get_info_for_evla_eb_deletion.science_product_locator;
+ancillary_fg_ids := array(select filegroup_id FROM ancillary_products WHERE ancillary_products.science_product_locator=get_info_for_evla_eb_deletion.science_product_locator OR ancillary_products.product_group_id=get_info_for_evla_eb_deletion.product_group_id);
+filegroup_ids := filegroup_ids || ancillary_fg_ids;
+execution_block_id := execution_blocks.execution_block_id FROM execution_blocks WHERE execution_blocks.science_product_locator=get_info_for_evla_eb_deletion.science_product_locator;
+observation_configuration_ids := array(select observation_configuration_id FROM observation_configurations WHERE observation_configurations.execution_block_id=get_info_for_evla_eb_deletion.execution_block_id);
+return;
+end;
+$$ Language plpgsql;
+
+create or replace function delete_metadata_for_evla_eb(eb_fileset_id varchar) returns void as $$
+declare
+eb_info record;
+begin
+eb_info := get_info_for_evla_eb_deletion(eb_fileset_id);
+delete FROM ancillary_products WHERE science_product_locator=eb_info.science_product_locator OR product_group_id=eb_info.product_group_id;
+delete FROM science_products_product_groups WHERE science_product_locator=eb_info.science_product_locator;
+delete FROM product_groups WHERE product_group_id=eb_info.product_group_id;
+delete FROM science_products_projects WHERE science_product_locator=eb_info.science_product_locator;
+delete FROM science_product_comments WHERE science_product_locator=eb_info.science_product_locator;
+delete FROM rh_locators WHERE locator=eb_info.science_product_locator;
+delete from subscans where observation_configuration_id = any (eb_info.observation_configuration_ids);
+delete from data_descriptions where observation_configuration_id = any (eb_info.observation_configuration_ids);
+delete FROM observation_configurations WHERE execution_block_id = eb_info.execution_block_id;
+delete FROM spectral_windows WHERE execution_block_id = eb_info.execution_block_id;
+delete FROM execution_blocks WHERE science_product_locator=eb_info.science_product_locator;
+delete FROM science_products WHERE science_product_locator=eb_info.science_product_locator;
+delete FROM files WHERE filegroup = any (eb_info.filegroup_ids);
+delete FROM filegroups WHERE filegroup_id = any (eb_info.filegroup_ids);
+return;
+end;
+$$ Language plpgsql;
+
+-- select delete_metadata_for_evla_eb('15A-397.sb31019491.eb31020561.57236.7198700463');
+-- select get_info_for_evla_eb_deletion('15A-397.sb31019491.eb31020561.57236.7198700463');