Add support for %h and %r escape characters in IdentityFile for SSH. (#10343)

* Add support for %h and %r escape characters in IdentityFile for SSH.
See section "IdentityFile" on https://linux.die.net/man/5/ssh_config for
details.

* Fix lint warnings.

Author: mannjani

tabby-ssh/src/session/ssh.ts

@@ -162,9 +162,11 @@ export class SSHSession {
         this.allAuthMethods = [{ type: 'none' }]
         if (!this.profile.options.auth || this.profile.options.auth === 'publicKey') {
             if (this.profile.options.privateKeys?.length) {
-                for (const pk of this.profile.options.privateKeys) {
+                for (let pk of this.profile.options.privateKeys) {
                     // eslint-disable-next-line @typescript-eslint/init-declarations
                     let contents: Buffer
+                    pk = pk.replace('%h', this.profile.options.host)
+                    pk = pk.replace('%r', this.profile.options.user)
                     try {
                         contents = await this.fileProviders.retrieveFile(pk)
                     } catch (error) {