Fixes draft note race condition with whitespace changes

What does this MR do and why?

Fixes a race condition with draft notes in that they would sometimes get displayed under every collapsed section. This gets caused by the line_code being returned as nil due to whitespace changes. To fix this issue we now save the line_code property into the database.

Migration down

== 20211122103051 AddLineCodeToDraftNotes: reverting ==========================
-- remove_column(:draft_notes, :line_code, :text)
   -> 0.0058s
== 20211122103051 AddLineCodeToDraftNotes: reverted (0.0102s) =================

== 20211124095704 AddDraftNotesLineCodeTextLimit: reverting ===================
-- transaction_open?()
   -> 0.0000s
-- transaction_open?()
   -> 0.0000s
-- execute("ALTER TABLE draft_notes\nDROP CONSTRAINT IF EXISTS check_c497a94a0e\n")
   -> 0.0019s
== 20211124095704 AddDraftNotesLineCodeTextLimit: reverted (0.0162s) ==========

Migration up

== 20211122103051 AddLineCodeToDraftNotes: migrating ==========================
-- add_column(:draft_notes, :line_code, :text)
   -> 0.0041s
== 20211122103051 AddLineCodeToDraftNotes: migrated (0.0042s) =================

== 20211124095704 AddDraftNotesLineCodeTextLimit: migrating ===================
-- transaction_open?()
   -> 0.0000s
-- current_schema()
   -> 0.0005s
-- transaction_open?()
   -> 0.0000s
-- execute("ALTER TABLE draft_notes\nADD CONSTRAINT check_c497a94a0e\nCHECK ( char_length(line_code) <= 255 )\nNOT VALID;\n")
   -> 0.0057s
-- current_schema()
   -> 0.0002s
-- execute("SET statement_timeout TO 0")
   -> 0.0007s
-- execute("ALTER TABLE draft_notes VALIDATE CONSTRAINT check_c497a94a0e;")
   -> 0.0035s
-- execute("RESET statement_timeout")
   -> 0.0006s
== 20211124095704 AddDraftNotesLineCodeTextLimit: migrated (0.0299s) ==========

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Closes #340815 (closed)