Enhance security information retrieval and handling (#1826)

* Enhance security information retrieval and handling

- Add support for operating MIC codes in security info fetching
- Update security uniqueness validation to handle unknown securities
- Improve security creation and update logic in Plaid investment sync
- Update combobox and view components to handle operating MIC codes
- Add unknown flag for securities with incomplete information

* Update schema.rb

* Refactor the need for mic codes

* Don't fetch prices unless a security has the necessary mic code

* Deduplication

* Lint

* Update Securities and Plaid Investment Sync

- Modify PlaidInvestmentSync to return plaid_security for USD cash
- Add non-null constraint to Securities ticker column
- Update Securities fixture to use exchange_operating_mic instead of exchange_mic

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Signed-off-by: Josh Pigford <josh@joshpigford.com>

db/migrate/20250207011850_add_exchange_operating_mic_to_securities.rb

@@ -0,0 +1,6 @@
+class AddExchangeOperatingMicToSecurities < ActiveRecord::Migration[7.2]
+  def change
+    add_column :securities, :exchange_operating_mic, :string
+    add_index :securities, :exchange_operating_mic
+  end
+end

db/migrate/20250207194638_adjust_securities_indexes.rb

@@ -0,0 +1,6 @@
+class AdjustSecuritiesIndexes < ActiveRecord::Migration[7.2]
+  def change
+    remove_index :securities, name: "index_securities_on_ticker_and_exchange_mic"
+    add_index :securities, [ :ticker, :exchange_operating_mic ], unique: true
+  end
+end

db/migrate/20250211161238_make_ticker_not_null.rb

@@ -0,0 +1,5 @@
+class MakeTickerNotNull < ActiveRecord::Migration[7.2]
+  def change
+    change_column_null :securities, :ticker, false
+  end
+end